Mitarbeiterinnen und Mitarbeiter

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Vita

Tobias heads the team Family Surveys at GESIS. The team is in charge of conducting the Family Research and Demographic Analysis (FReDA) panel in Germany and is involved with data collection for the German Family Panel (pairfam). Tobias is a PI of FReDA, which is funded by the Federal Ministry of Education and Research (BMBF) from 2020 to 2024. Moreover, the team works on integrative tasks as part of the Integrated Survey and Data Infrastructure (IEDI) at GESIS, of which Tobias is an elected spokesperson.  

Before shifting its attention to family surveys, Tobias' team was responsible for conducting
  • European Values Study (EVS): German survey
  • German Longitudinal Election Study (GLES): Candidate Campaign Survey
  • German Longitudinal Election Study (GLES): Rolling Cross-Section Campaign Survey
  • World Values Survey (WVS): German survey
In addition to these large-scale projects, Tobias is involved in numerous smaller data collection efforts, mostly surveys. 

Before becoming a team lead at GESIS in 2017, between 2011 to 2016, he was a research associate and later senior researcher at GESIS and a member of the German Longitudinal Election Study (GLES) project. He also held positions as a visiting researcher at Yale University (2015) and Utrecht University (2018). 

Tobias was granted a venia legendi in "social science research methods" (Habilitation) by the Unversity of Mannheim in 2020. In 2014, he received his Ph.D. from the University of Mannheim, where he had also studied social sciences. 

Apart from his tasks at GESIS, Tobias serves as Associated Editor of Survey Research Methods and in the Editorial Review Board of International Journal of Market Research.

His methodological research interests include survey design, data quality, nonresponse, correction methods for biases, and longitudinal analyses. 

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Veröffentlichungen

Publikation

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Zeitschriftenaufsatz

Gummer, Tobias, and Bella Struminskaya. 2020. "Early and Late Participation during the Field Period: Response Timing in a Mixed-Mode Probability-Based Panel Survey." Sociological Methods & Research online first 1-24. doi: http://dx.doi.org/10.1177/0049124120914921.

Schmidt, Katharina, Tobias Gummer, and Joss Roßmann. 2020. "Effects of Respondent and Survey Characteristics on the Response Quality of an Open-Ended Attitude Question in Web Surveys." methods, data, analyses 14 (1): 3-34. doi: http://dx.doi.org/10.12758/mda.2019.05.

Meitinger, Katharina, Sven Stadtmüller, Henning Silber, Roman Auriga, Michael Bergmann, Michael Blohm, Manuela S. Blumenberg, Pablo Christmann, Barbara Felderer, Corinna Frodermann, Florian Griese, Tobias Gummer, Anita Kottwitz, Kristina Krell, Ulrich Krieger, Elisabeth Liebau, Silke Martin, Andre Müller-Kuller, Beatrice Rammstedt, Ines Schaurer, Annette Scherpenzeel, Claudia Schmiedeberg, Tobias Schmidt, Christian Schnaudt, Sascha Verhoeven, and Anouk Zabal. 2020. "Fieldwork Monitoring in Practice: Insights from 17 Large-scale Social Science Surveys in Germany." Survey Methods: Insights from the Field (SMIF) 2020 (18.05.2020). doi: http://dx.doi.org/10.13094/SMIF-2020-00006.

Meitinger, Katharina, Daniela Ackermann-Piek, Michael Blohm, Brad Edwards, Tobias Gummer, and Henning Silber. 2020. "Fieldwork monitoring strategies for interviewer-administered surveys." Survey Methods: Insights from the Field (SMIF). Special issue: Fieldwork Monitoring Strategies for Interviewer-Administered Surveys. doi: http://dx.doi.org/10.13094/SMIF-2020-00007.

Kunz, Tanja, Camille Landesvatter, and Tobias Gummer. 2020. "Informed consent for paradata use in web surveys." International Journal of Market Research 62 (4): 396-408. doi: http://dx.doi.org/10.1177/1470785320931669.

Gummer, Tobias, Vera Vogel, Tanja Kunz, and Joss Roßmann. 2020. "Let’s put a smile on that scale: Findings from three web survey experiments." International Journal of Market Research 62 (1): 18-26. doi: http://dx.doi.org/10.1177/1470785319858598.

Gummer, Tobias, Claudia Schmiedeberg, Martin Bujard, Pablo Christmann, Karsten Hank, Tanja Kunz, Detlev Lück, and Franz J. Neyer. 2020. "The impact of Covid-19 on fieldwork efforts and planning in pairfam and FReDA-GGS." Survey Research Methods 14 (2): 223-227. doi: http://dx.doi.org/10.18148/srm/2020.v14i2.7740.

Kunz, Tanja, and Tobias Gummer. 2020. "Understanding respondents’ attitudes toward web paradata use." Social Science Computer Review 38 (6): 739-753. doi: http://dx.doi.org/10.1177/0894439319826904.

Gummer, Tobias, and Tanja Kunz. 2020. "Using only numeric labels instead of verbal labels: Stripping rating scales to their bare minimum in web surveys." Social Science Computer Review online first 1-27. doi: http://dx.doi.org/10.1177/0894439320951765.

Gauly, Britta, Jessica Daikeler, Tobias Gummer, and Beatrice Rammstedt. 2020. "What’s my wage again?: Comparing survey and administrative data to validate earning measures." International Journal of Social Research Methodology 23 (2): 215-228. doi: http://dx.doi.org/10.1080/13645579.2019.1657691.

Roßmann, Joss, Tobias Gummer, and Lars Kaczmirek. 2020. "Working with User Agent Strings in Stata: The parseuas Command." Journal of Statistical Software 92 (February 2020): 16. doi: http://dx.doi.org/10.18637/jss.v092.c01.

Gummer, Tobias. 2019. "Assessing Trends and Decomposing Change in Nonresponse Bias: The Case of Bias in Cohort Distributions." Sociological Methods & Research 48 (1): 92-115. doi: http://dx.doi.org/10.1177/0049124117701479.

Gummer, Tobias, Franziska Quoß, and Joss Roßmann. 2019. "Does increasing mobile device coverage reduce heterogeneity in completing web surveys on smartphones?." Social Science Computer Review 37 (3): 371-384. doi: http://dx.doi.org/10.1177/0894439318766836.

Gummer, Tobias, Manuela S. Blumenberg, and Joss Roßmann. 2019. "Learning effects in coders and their implications for managing content analyses." International Journal of Social Research Methodology 22 (2): 139-152. doi: http://dx.doi.org/10.1080/13645579.2018.1503789.

Gummer, Tobias, and Tanja Kunz. 2019. "Relying on external information sources when answering knowledge questions in web surveys." Sociological Methods & Research online first. doi: http://dx.doi.org/10.1177/0049124119882470.

Gummer, Tobias, and Joss Roßmann. 2019. "The effects of propensity score weighting on attrition biases in attitudinal, behavioral, and socio-demographic variables in a short-term web-based panel survey." International Journal of Social Research Methodology 22 (1): 81-95. doi: http://dx.doi.org/10.1080/13645579.2018.1496052.

Quinlan, Stephen, Tobias Gummer, Joss Roßmann, and Christof Wolf. 2018. "‘Show me the money and the party!’ – variation in Facebook and Twitter adoption by politicians." Information, Communication & Society 21 (8): 1031-1049. doi: http://dx.doi.org/10.1080/1369118X.2017.1301521.

Gummer, Tobias, and Jessica Daikeler. 2018. "A Note on How Prior Survey Experience With Self-Administered Panel Surveys Affects Attrition in Different Modes." Social Science Computer Review online first. doi: http://dx.doi.org/10.1177/0894439318816986.

Gummer, Tobias, and Jan Eric Blumenstiel. 2018. "Experimental Evidence on Reducing Nonresponse Bias Through Case Prioritization: The Allocation of Interviewers." Field Methods 30 (2): 124-139. doi: http://dx.doi.org/10.1177/1525822X18757967.

Roßmann, Joss, Tobias Gummer, and Henning Silber. 2018. "Mitigating Satisficing in Cognitively Demanding Grid Questions: Evidence from Two Web-Based Experiments." Journal of Survey Statistics and Methodology 6 (3): 376-400. doi: http://dx.doi.org/10.1093/jssam/smx020.

Gummer, Tobias, Joss Roßmann, and Henning Silber. 2018. "Using instructed response items as attention checks in web surveys: Properties and implementation." Sociological Methods & Research online first 1-27. doi: http://dx.doi.org/10.1177/0049124118769083.

Silber, Henning, Joss Roßmann, and Tobias Gummer. 2018. "When Near Means Related: Evidence from Three Web Survey Experiments on Inter-Item Correlations in Grid Questions." International Journal of Social Research Methodology 21 (3): 275-288. doi: http://dx.doi.org/10.1080/13645579.2017.1381478.

Roßmann, Joss, and Tobias Gummer. 2016. "Using Paradata to Predict and Correct for Panel Attrition." Social Science Computer Review 34 (3): 312-332. doi: http://dx.doi.org/10.1177/0894439315587258.

Gummer, Tobias, and Joss Roßmann. 2015. "Explaining Interview Duration in Web Surveys: A Multilevel Approach." Social Science Computer Review 33 (2): 217-234. doi: http://dx.doi.org/10.1177/0894439314533479.

Gummer, Tobias, and Joss Roßmann. 2013. "Good Questions, Bad Questions? A Post-survey Evaluation Strategy Based on Item Nonresponse." Survey Methods : Insights from the Field August. http://surveyinsights.org/?p=2330.

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Beitrag im Sammelwerk

Gummer, Tobias. 2020. "Adaptive and Responsive Survey Designs." In SAGE Research Methods Foundations, edited by Paul Atkinson, Sara Delamont, Alexandru Cernat, Joseph W. Sakshaug, and Richard A. Williams, 1-12. SAGE Publications Ltd.. doi: http://dx.doi.org/10.4135/9781526421036912806.

Gummer, Tobias, and Anne-Kathrin Stroppe. 2019. "Regierungs- und Parteileistung." In Zwischen Polarisierung und Beharrung : Die Bundestagswahl 2017, edited by Sigrid Roßteutscher, Rüdiger Schmitt-Beck, Harald Schoen, Bernhard Weßels, and Christof Wolf, Wahlen in Deutschland 3, 279-294. Baden-Baden: Nomos.

Roßmann, Joss, Manuela S. Blumenberg, and Tobias Gummer. 2017. "Einleitung." In Bericht zur Datenqualität der GLES 2013, edited by Joss Roßmann, Manuela S. Blumenberg, and Tobias Gummer, GESIS Papers 2017/13, 11-15. doi: http://dx.doi.org/10.21241/ssoar.52179.

Gummer, Tobias, and Joss Roßmann. 2017. "Item-Nonresponse." In Bericht zur Datenqualität der GLES 2013, edited by Joss Roßmann, Manuela S. Blumenberg, and Tobias Gummer, GESIS Papers 2017/13, 85-112. doi: http://dx.doi.org/10.21241/ssoar.52179.

Blumenstiel, Jan Eric, and Tobias Gummer. 2015. "Prävention, Korrektur oder beides? Drei Wege zur Reduzierung von Nonresponse Bias mit Propensity Scores." In Nonresponse Bias: Qualitätssicherung sozialwissenschaftlicher Umfragen, edited by Jürgen Schupp, and Christof Wolf, 13-44. Wiesbaden: Springer VS.

Roßmann, Joss, Tobias Gummer, and Christof Wolf. 2014. "Twitter im Wahlkampf." In Zwischen Fragmentierung und Konzentration: Die Bundestagswahl 2013, edited by Rüdiger Schmitt-Beck, Hans Rattinger, Sigrid Roßteutscher, Bernhard Weßels, and Christof Wolf, Wahlen in Deutschland 2, 61-72. Baden-Baden: Nomos. doi: http://dx.doi.org/10.5771/9783845250090.

Roßmann, Joss, Manuela S. Blumenberg, and Tobias Gummer. 2013. "Einleitung." In Bericht zur Datenqualität der GLES 2009, edited by Manuela S. Blumenberg, Joss Roßmann, and Tobias Gummer, GESIS - Technical Reports 2013/14, 12-13. http://www.gesis.org/publikationen/gesis-technical-reports/.

Gummer, Tobias, and Joss Roßmann. 2013. "Item-nonresponse." In Bericht zur Datenqualität der GLES 2009, edited by Manuela S. Blumenberg, Joss Roßmann, and Tobias Gummer, GESIS - Technical Reports 2013/14, 40-132. http://www.gesis.org/publikationen/gesis-technical-reports/.

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Herausgeberschaft

Meitinger, Katharina, Daniela Ackermann-Piek, Michael Blohm, Brad Edwards, Tobias Gummer, and Henning Silber, ed. 2020. Special Issue: Fieldwork monitoring strategies for interviewer-administered surveys. Survey Methods: Insights from the Field. Lausanne: Swiss Found. for Research in Social Sciences. https://surveyinsights.org/?cat=459.

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Monographie

Gummer, Tobias. 2015. Multiple Panels in der empirischen Sozialforschung: Evaluation eines Forschungsdesigns mit Beispielen aus der Wahlsoziologie. Wiesbaden: Springer VS.

Gummer, Tobias. 2010. Die Existenzdauer von Unternehmen in Deutschland: ein Ost- West Vergleich. Mannheimer sozialwissenschaftliche Abschlussarbeiten 10/001. urn: http://nbn-resolving.de/urn:nbn:de:bsz:180-madoc-29953.

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Arbeits- und Diskussionspapier

Roßmann, Joss, Manuela S. Blumenberg, and Tobias Gummer. 2017. Bericht zur Datenqualität der GLES 2013. GESIS Papers 2017/13. Köln: GESIS. doi: http://dx.doi.org/10.21241/ssoar.52179.

Gummer, Tobias, Manuela S. Blumenberg, and Constanze Vilgis. 2017. Computing weights for the German Longitudinal Election Study (GLES) 2009-2013. GESIS Papers 2017/07. http://www.ssoar.info/ssoar/handle/document/50704.

Blumenberg, Manuela S., and Tobias Gummer. 2016. Gewichtung in der German Longitudinal Election Study 2013. GESIS Papers 2016/1. http://www.gesis.org/unser-angebot/publikationen/gesis-papers/.

Blumenstiel, Jan Eric, and Tobias Gummer. 2014. Langfrist-Panels der German Longitudinal Election Study (GLES): Methodik und Durchführung der Erhebungen im Jahr 2012 und zur Bundestagswahl 2013. GESIS - Technical Reports 2014/15. Mannheim: GESIS. http://www.gesis.org/publikationen/gesis-technical-reports/.

Kaczmirek, Lars, Philipp Mayr, Ravi Vatrapu, Arnim Bleier, Manuela S. Blumenberg, Tobias Gummer, Abid Hussain, Katharina E. Kinder-Kurlanda, Kaveh Manshaei, Mark Thamm, Katrin Weller, Alexander Wenz, and Christof Wolf. 2014. Social media monitoring of the campaigns for the 2013 German Bundestag elections on Facebook and Twitter. GESIS Working Papers 31. Köln: GESIS. urn: http://nbn-resolving.de/urn:nbn:de:0168-ssoar-381955 . http://www.ssoar.info/ssoar/handle/document/38195.

Blumenberg, Manuela S., Joss Roßmann, and Tobias Gummer. 2013. Bericht zur Datenqualität der GLES 2009. GESIS - Technical Reports 2013/14. http://www.gesis.org/publikationen/gesis-technical-reports/.

Blumenberg, Manuela S., and Tobias Gummer. 2013. Gewichtung in der German longitudinal election study 2009. GESIS - Technical Reports 2013/19. http://www.gesis.org/publikationen/gesis-technical-reports/.

Blumenstiel, Jan Eric, and Tobias Gummer. 2013. Long-Term Panels of the German Longitudinal Election Study (GLES): concept and implementation. GESIS - Technical Reports 2013/11. http://www.gesis.org/publikationen/gesis-technical-reports/.

Blumenstiel, Jan Eric, and Tobias Gummer. 2012. Langfrist-Panels der German Longitudinal Election Study (GLES): Konzeption, Durchführung, Aufbereitung und Archivierung. GESIS - Technical Reports 2012/11. http://www.gesis.org/publikationen/gesis-technical-reports/.

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Daten/Software

Glinitzer, Konstantin, Tobias Gummer, Joss Roßmann, and Malte Kaukal. 2018. plztowknr: A Stata module to translate German zip codes into electoral districts: (Version: 1.0) [Computer Software]. Chestnut Hill, MA: Boston College. https://EconPapers.repec.org/RePEc:boc:bocode:s458480.

Gummer, Tobias. 2015. REPLACEBYLAB: Stata module to replace values by drawing on value labels (Version: 0.8)” [Computer Software]. Chestnut Hill, MA: Boston College. http://econpapers.repec.org/software/bocbocode/S457973.htm.

Roßmann, Joss, and Tobias Gummer. 2014. PARSEUAS: Stata Module to Extract Detailed Information From User Agent Strings (Version: 1.0) [Computer Software]. Chestnut Hill, MA: Boston College. http://econpapers.repec.org/software/bocbocode/S457937.htm.

Lehre

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Seminar

Gummer, Tobias. 2013. "Spezielle Soziologie: Organisationen und ihre Umwelt." Universität Mannheim. HS 2013: 3 SWS.

Wolf, Christof, and Tobias Gummer. 2011. "Hauptseminar: Soziale Ungleichheit und Soziale Mobilität." Universität Mannheim. HS 2011: 2 SWS.

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Sonstiges

Gummer, Tobias. 2017. "Data Preparation with Stata."

Blumenberg, Johannes N., and Tobias Gummer. 2017. "Einführung in die Datenanalyse mit Stata." Mannheim.

Blumenberg, Manuela S., and Tobias Gummer. 2015. "Einführung in die Datenanalyse mit Stata." Mannheim.

Blumenberg, Manuela S., and Tobias Gummer. 2014. "Einführung in die Datenanalyse mit Stata." Mannheim. 10./11.02.2014.

Blumenberg, Manuela S., and Tobias Gummer. 2014. "Stata für Fortgeschrittene." Bonn. 20./21.08.2014.

Gummer, Tobias, and Manuela S. Kulick. 2013. "Einführung in die Datenanalyse mit Stata." Mannheim. 22./23.04.2013.

Gummer, Tobias, and Manuela S. Kulick. 2012. "Einführung in die Datenanalyse mit Stata." Mannheim. 24./25.10.2012.

Vortrag

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Konferenzbeitrag

Silber, Henning, Joss Roßmann, and Tobias Gummer. 2019. "Attention checks in web surveys: The issue of false positives due to non-compliance." GOR 19 : General Online Research Conference, 11.03.2019.

Gummer, Tobias, Guðbjörg Andrea Jónsdóttir, Ruud Luijxk, and Michele Ernst Staehli. 2019. "Conducting Cross-Cultural General Population Surveys with Matrix Designs in Self-Administered Modes: Insights from the European Values Study." ESRA 2019 : 8th Conference of the European Survey Research Association, Zagreb (Croatia), 17.07.2019.

Breuer, Johannes, Sebastian Stier, Pascal Siegers, Tobias Gummer, and Arnim Bleier. 2019. "Consent to Collecting and Linking Twitter Data in a Combined Webtracking and Survey Study." ESRA 2019 : 8th Conference of the European Survey Research Association, Zagreb (Croatia), 17.07.2019. https://www.europeansurveyresearch.org/conf2019/uploads/459/2790/4/Social_media_linking_Breuer_et_al_ESRA19_new.pdf.

Ochsner, Michael, Guðbjörg Andrea Jónsdóttir, Tobias Gummer, and Jessica Herzing. 2019. "Cross-Cultural Surveys in Matrix Design: Potential and Pitfalls of Multiple Imputation for Analysing Incomplete Data by Design." ESRA 2019 : 8th Conference of the European Survey Research Association, Zagreb (Croatia), 17.07.2019.

Christmann, Pablo, Tobias Gummer, Sascha Hähnel, and Christof Wolf. 2019. "Does the mode matter?: An experimental comparison of survey responses between face-to-face and mixed-mode surveys." ESRA 2019 : 8th Conference of the European Survey Research Association, Zagreb (Croatia), 17.07.2019. https://www.europeansurveyresearch.org/conf2019/uploads/393/3000/71/ESRA_Christmann_et_al..pdf.

Gummer, Tobias, and Tanja Kunz. 2019. "Effects of using numeric instead of semantic labels in rating scales." GOR 19 : General Online Research Conference, 07.03.2019.

Stier, Sebastian, Johannes Breuer, Pascal Siegers, Tobias Gummer, and Arnim Bleier. 2019. "Enemies of the People: Party cues, populism and selective exposure to news – An investigation combining web tracking and survey data." DVPW und DGPuK PolKomm-Tagung 2019, 09.02.2019.

Glinitzer, Konstantin, Tobias Gummer, and Markus Wagner. 2019. "Learning Facts about Migration: Politically Motivated Learning of Polarizing Information about Refugees." 9th Annual Conference of the European Political Science Association (EPSA), 22.06.2019.

Breuer, Johannes, Sebastian Stier, Pascal Siegers, Tobias Gummer, and Arnim Bleier. 2019. "Linking survey data with social media data and the importance of informed consent." GOR 19 : General Online Research Conference, TH Köln, Köln, 07.03.2019. https://www.gor.de/gor19/index.php?page=downloadPaper&filename=Breuer-Linking_survey_data_with_social_media_data_and_the_importance-210.pdf&form_id=210&form_version=final.

Kunz, Tanja, and Tobias Gummer. 2019. "Perceived and Actual Respondent Burden and the Effects on Data Quality in Web Surveys." ESRA 2019 : 8th Conference of the European Survey Research Association, Zagreb (Croatia), 17.07.2019.

Murray-Watters, Alexander, Stefan Zins, Henning Silber, Tobias Gummer, and Clemens Lechner. 2019. "River Sampling – a Fishing Expedition: A Non-Probability Case Study." Annual Conference of the American Association for Public Opinion Research (AAPOR), 18.05.2019.

Kartsounidou, Evangelia, Rebekka Kluge, Henning Silber, and Tobias Gummer. 2019. "Survey Experience and its Impact on Response Behavior in Panel Surveys: Evidence from the GESIS Panel Data." GESIS Panel User Conference, 11.03.2019.

Kartsounidou, Evangelia, Rebekka Kluge, Henning Silber, and Tobias Gummer. 2019. "Survey Experience and its Impact on Response Behaviour in Panel Surveys: Evidence from the GESIS Panel." 8th Conference of the European Survey Research Association (ESRA) , 17.07.2019.

Roßmann, Joss, Tobias Gummer, David Bretschi, and Jessica Daikeler. 2019. "Using Attention Checks in Mail Questionnaires and Probability-Based Samples: Initial Evidence from a Mixed-Mode Survey Experiment." ESRA 2019 : 8th Conference of the European Survey Research Association, Zagreb (Croatia), 16.07.2019.

Stier, Sebastian, Johannes Breuer, Pascal Siegers, Tobias Gummer, and Arnim Bleier. 2019. "Where Do They Get Their 'News'?: Preference for Right-Wing Populist Parties and Online News Consumption in Germany." ESRA 2019 : 8th Conference of the European Survey Research Association, Zagreb (Croatia), 18.07.2019. https://www.europeansurveyresearch.org/conf2019/uploads/164/3238/5/Stier_et_al._AfD_online_news_ESRA_2019.pdf.

Zins, Stefan, Tobias Gummer, Clemens Lechner, and Alexander Murray-Watters. 2018. "Comparing complex measurement instruments across probabilistic and non-probabilistic online surveys." Workshop on Probability-Based and Nonprobability Survey Research.

Gummer, Tobias, Pablo Christmann, Sascha Hähnel, and Christof Wolf. 2018. "Conducting a survey under unclear outcome conditions by using a responsive survey design." Midterm Conference ESA Research Network 21 "Quantitative Methods", 03.10.2018.

Kunz, Tanja, Tobias Gummer, and Marek Fuchs. 2018. "Differences in data quality as a function of early versus late positioning of questions in a web survey." Annual Conference of the American Association for Public Opinion Research (AAPOR), 16.05.2018.

Roßmann, Joss, and Tobias Gummer. 2018. "Do modifications to the traditional grid question design reduce the respondents’ burden and increase response quality?." General Online Research (GOR18), 28.02.2018.

Silber, Henning, Roßmann Joss, Tobias Gummer, and Kai Willem Weyandt. 2018. "Examining Item Nonresponse on Three Levels: Question, Respondent, and Interviewer Characteristics." WAPOR 71st Annual Conference, 28.06.2018.

Stier, Sebastian, Johannes Breuer, Pascal Siegers, Tobias Gummer, and Arnim Bleier. 2018. "Improving Research on Political Behavior by Integrating Survey Data and Digital Trace Data." BigSurv18 Big Data Meets Survey Science, 26.10.2018.

Stier, Sebastian, Johannes Breuer, Pascal Siegers, Tobias Gummer, and Arnim Bleier. 2018. "Selective exposure to political news: An investigation combining web tracking and survey data." ECPR General Conference 2018, 25.08.2018.

Gummer, Tobias, Pablo Christmann, Sascha Hähnel, and Christof Wolf. 2018. "Using a Responsive Design to Conduct a Survey under Unclear Outcome Conditions." CSDI Workshop, 26.03.2018.

Kunz, Tanja, and Tobias Gummer. 2018. "Using Placeholder Text in Narrative Open-Ended Questions in Web Surveys." General Online Research Conference (GOR), 02.03.2018.

Gauly, Britta, Jessica Daikeler, Tobias Gummer, and Beatrice Rammstedt. 2018. "What's your Wage? Comparing Survey and Administrative Data to Validate Earning Information." Perspectives on (Un-) Employment - 10th Interdisciplinary Ph.D. Workshop , 18.01.2018.

Gummer, Tobias, and Tanja Kunz. 2018. "Window Switching When Answering Knowledge Questions in Web Surveys." General Online Research Conference (GOR), 01.03.2018.

Gummer, Tobias, Joss Roßmann, and Henning Silber. 2017. "Does the Exposure to an Instructed Response Item Attention Check Affect Response Behavior?." General Online Research Conference (GOR 2017).

Silber, Henning, Tobias Gummer, and Joss Roßmann. 2017. "Question Characteristics and Response Behavior." ESRA 2017: 7th Conference of the European Survey Research Association.

Struminskaya, Bella, and Tobias Gummer. 2017. "Risk of nonresponse bias and the length of the field period in a mixed-mode general population panel." Household Survey Nonresponse Workshop, 30.08.2017.

Struminskaya, Bella, and Tobias Gummer. 2017. "The Link Between Nonresponse Bias and the Length of the Field Period in a Mixed-Mode General Population Panel." Joint Statistical Meeting, 29.07.2017.

Schmidt, Katharina, Tobias Gummer, and Joss Roßmann. 2017. "What Characteristics Affect the Response Quality of Open-ended Attitude Questions? A Study on Respondent and Survey Level Factors in Web Surveys." ESRA 2017: 7th Conference of the European Survey Research Association, 17.07.2017.

Gummer, Tobias, Joss Roßmann, and Henning Silber. 2017. "Who fails and who passes instructed response item attention checks in web surveys?." ESRA 2017: 7th Conference of the European Survey Research Association.

Gummer, Tobias, and Bella Struminskaya. 2017. "Who participates early or late in a survey? Results from a mixed-mode general population panel." 13th Conference of the European Sociological Association (ESA), 28.08.2017.

Gummer, Tobias. 2016. "Comparing different selection criteria when applying case prioritization: A simulation study." Midterm Conference ESA Research Network 21 "Quantitative Methods", 13.10.2016.

Struminskaya, Bella, and Tobias Gummer. 2016. "Participation in a mixed-mode panel over the course of the field period: An analysis of different response propensity strata." General Online Research Conference (GOR 2016), 02.03.2016.

Gummer, Tobias, and Joss Roßmann. 2016. "Propensity score weighting in a web-based panel survey: Comparing the effects on attrition biases in attitudinal, behavioral, and socio-demographic variables." General Online Research Conference (GOR 2016), 02.03.2016.

Roßmann, Joss, Tobias Gummer, and Stephen Quinlan. 2016. "The effects of using Facebook and Twitter on candidates’ electoral success: The case of the German Federal Election 2013." General Online Research Conference (GOR 2016), 02.03.2016.

Gummer, Tobias. 2015. "Measuring Social and Individual Change with Different Longitudinal Research Designs." ESRA 2015: 6th Conference of the European Survey Research Association.

Gummer, Tobias. 2015. "Research designs and estimating causal effects: The impact of age-period-cohort effects on a design´s performance." ESA 2015: 12th Conference of the European Sociological Association.

Kaczmirek, Lars, Tobias Gummer, and Manuela S. Blumenberg. 2015. "Research potential of Twitter and Facebook in the election year 2013 in Germany." Webdatanet conference, 27.05.2015.

Quinlan, Stephen, Tobias Gummer, Joss Roßmann, and Christof Wolf. 2015. "Show me the money and the party: Social media adoption by candidates in the 2013 German elections." EPSA 2015: 5th Annual General Conference of the European Political Science Association, 25.06.2015.

Quinlan, Stephen, Tobias Gummer, Joss Roßmann, and Christof Wolf. 2015. "Social media in election campaigns: Different channels, different patterns?." GOR 15: General Online Research Conference.

Gummer, Tobias, Joss Roßmann, and Christof Wolf. 2014. "Candidates’ Twitter Use in the German Election 2013." GOR 14 : General Online Research Conference.

Gummer, Tobias, and Joss Roßmann. 2014. "Does the Use of Paradata in Propensity Score Weighting Improve the Correction of Panel Attrition in a Web-based Survey?." VI European Congress of Methodology.

Kaczmirek, Lars, Philipp Mayr, Ravi Vatrapu, Arnim Bleier, Manuela S. Blumenberg, Tobias Gummer, Kjeld Hansen, Abid Hussein, Zeshan Ali Jaffari, Katharina E. Kinder-Kurlanda, Haiko Lietz, Markus Strohmaier, Claudia Wagner, Katrin Weller, Christof Wolf, and Chris James Zimmerman. 2014. "PEP-TF: Social media monitoring of the campaigns for the 2013 German Bundestag elections on Facebook and Twitter." Social Media Communication Workshop, Mannheim, 28.03.2014.

Gummer, Tobias, and Joss Roßmann. 2014. "Using Paradata to Predict and to Correct for Panel Attrition in a Web-Based Panel Survey." 3rd Annual Meeting of the GLES Young Researchers.

Roßmann, Joss, and Tobias Gummer. 2014. "Using Paradata to Predict and to Correct for Panel Attrition in a Web-Based Panel Survey." GOR 14 : General Online Research Conference.

Gummer, Tobias, Lars Kaczmirek, and Manuela S. Blumenberg. 2014. "Zur Nutzbarkeit von Social Media Daten für die Wahlforschung: Konzeptionelle, methodische und interdisziplinäre Herausforderungen." Jahrestagung Sektion "Methoden der Politikwissenschaft" der DVPW.

Gummer, Tobias. 2013. "Enterprises in reunified Germany: merging strategic action fields by force." 11th Conference of the European Sociological Association (ESA).

Gummer, Tobias, and Joss Roßmann. 2013. "Explaining interview duration in web surveys on political attitudes and behavior: a multilevel approach." 66th Annual Conference of the World Association for Public Opinion Research (WAPOR).

Roßmann, Joss, and Tobias Gummer. 2013. "Interview Duration in Web Surveys: Integrating Different Levels of Explanation." GOR 13 : General Online Research Conference. http://conftool.gor.de/conftool13/index.php?page=downloadPaper&filename=Ro%C3%9Fmann-Interview_Duration_in_Web_Surveys-118.pdf&form_id=118&form_version=final.

Gummer, Tobias. 2013. "Merging strategic action fields: the reunification of Germany as a natural experiment." 5th Conference of the European Survey Research Association (ESRA).

Gummer, Tobias, and Jan Eric Blumenstiel. 2013. "Prävention, Korrektur oder beides? Drei Wege zur Reduzierung von Nonresponse Bias mit Propensity Scores." Gemeinsame Tagung der Arbeitsgemeinschaft sozialwissenschaftlicher Institute (ASI) und der Sektion "Methoden der empirischen Sozialforschung" der Deutschen Gesellschaft für Soziologie.

Gummer, Tobias. 2013. "What is the extent and impact of population dynamics we desperately try to adjust for?." 5th Conference of the European Survey Research Association (ESRA).

Gummer, Tobias. 2012. "Erfassung von Wandel mittels hybrider Paneldesigns: Eine Simulation." Gemeinsame Frühjahrstagung der Sektionen "Methoden der empirischen Sozialforschung" und "Modellbildung und Simulation" der Deutschen Gesellschaft für Soziologie.

Gummer, Tobias. 2012. "The Potential of Hybrid Panel Designs to Measure Change in Electoral Populations." 4th ECPR Graduate Student Conference.

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Christmann, Pablo, Tobias Gummer, Sascha Hähnel, and Christof Wolf. 2019. "Responsive mixed-mode and face-to-face surveys: An experimental comparison in the context of the European Values Study." Mannheim Survey Infrastructures Research Colloquium, Universität Mannheim, 05.02.2019.

Gummer, Tobias, Pablo Christmann, Sascha Hähnel, and Christof Wolf. 2019. "Responsive mixed-mode experiences of European Values Study (EVS) Germany." 4th SERISS Survey Experts Network Workshop ‘Survey fieldwork cost’, 17.05.2019.

Christmann, Pablo, Tobias Gummer, Sascha Hähnel, and Christof Wolf. 2018. "Conducting probability based mixed-mode surveys: Experimental evidence from the European Values Study." NatCen-ESS ERIC-City methodology seminar series, 06.09.2018. https://www.city.ac.uk/events/2018/september/conducting-probability-based-mixed-mode-surveys-experimental-evidence-from-the-european-values-study.

Hähnel, Sascha, Pablo Christmann, Tobias Gummer, and Christof Wolf. 2018. "Einsatz eines responsiven Mixed-Mode Designs: Ergebnisse eines Experiments im Rahmen der European Values Study." Panelworkshop zum Thema Erhebungskosten und Strategien zur Steigerung der Kosteneffizienz, 15.10.2018.

Christmann, Pablo, Tobias Gummer, Sascha Hähnel, and Christof Wolf. 2018. "Mixed-Mode und Face-to-Face Umfragen: Ein experimenteller Vergleich im Rahmen der European Values Study." Panelworkshop zum Thema Erhebungskosten und Strategien zur Steigerung der Kosteneffizienz, 15.10.2018.

Christmann, Pablo, Tobias Gummer, Sascha Hähnel, and Christof Wolf. 2018. "Mixed-Mode und Face-to-Face Umfragen: Ein experimenteller Vergleich im Rahmen der European Values Study." Gemeinsame Sitzung von Vertreterinnen und Vertretern des ADM Arbeitskreis Deutscher Markt- und Sozialforschungsinstitute, der Arbeitsgemeinschaft Sozialwissenschaftlicher Institute (ASI) und des Statistischen Bundesamtes (Destatis), 30.10.2018.

Gummer, Tobias. 2017. "Multiple Panels in der empirischen Sozialforschung." Deutsches Jugendinstitut (DJI), 19.04.2017.

Gummer, Tobias. 2015. "Analyzing change: The role of research designs and different patterns of change." Center for Research on Inequalities and the Life Course.

Gummer, Tobias. 2015. "Case prioritization in a survey: Comparing different selection criteria." 4th Workshop "Advances in Adaptive and Responsive Survey Design".