In order to be able to generalize the collected data of a survey to the population, complex demands are made on the construction of the sample. The focus thereby is on planning a suitable sample design. This should be adapted to both the population and the survey. Especially non-random samples and complex random samples are demanding. We are happy to provide advice on planning the appropriate sample for your research project.
The planning of the appropriate sample design as well as the corresponding sample size should be well considered at the beginning of each survey and tailored to the target population (population), the survey instrument and the respective conditions of the research project (e.g. budget). GESIS supports you in this process both by advising on sample designs and sample size planning.
Non-probability samples are samples that are drawn non-randomly or deterministically. These include quota sampling and the (self-)recruitment of respondents, for example on websites. Especially the latter is heavily used in conjunction with the increasing use of online surveys. We provide advice on the use of non-probability samples for your specific research questions, discuss potential uses and pitfalls, and show you concrete courses of action.
We have compiled various sets of information and hands-on guidelines on frequently occurring consulting topics. These already answer many questions that may arise when planning a study and collecting data. You can find this information under Basic Knowledge.
Our consulting services in the form of 'helping you to help yourself' are free of charge. Additionally, we are happy to support you with more in-depth services, which are fee-based. You will find further information in our pricing overview. (74 kB)
Here, you can access our form for consulting services. With this form, you can quickly and easily request individual advice from our experts.