Study: MZ 2007
Additional Programs
- Health insurance (Sampling Fraction: 1% )
- Additional information on economic activity (II) (Sampling Fraction: 1% )
Ad-hoc-module EU Labour Force Survey
- Work-related accidents, health problems and hazardous exposure (Sampling Fraction: 0.1% )
Changes In Questionnaire
- In order to improve the measurement of ILO labour status, in particular, the fieldwork and a number of questions relating to labour market participation (especially EF77–EF86) have undergone changes since 2005. Hence, distribution differences may be related to labour market changes or they may be the result of a methodological artefact, namely changes to questions (see Köhne-Finster and Lingnau 2008; Körner and Puch 2009).
- Compared to 2006, a number of questions in the 2007 MC are worded differently or have different response categories.
Variables in the 2007 and 2006 Microcensuses and changes thereto
Variable |
Label / Description of change |
Question- number 2007 |
Question- number 2006 |
|---|---|---|---|
| EF10 | Year of construction of the dwelling Measured in a more differentiated way in the 2006 MC (Additional programme on the housing situation: EF494). |
19 | 122 |
| EF49 | Marital status Additional categories: Registered partner deceased, Registered partnership dissolved See also EF735, EF757, EF765, EF823, EF847 |
8 | 8 |
| EF244 | Unemployment Benefit I or II New question text: Hartz IV |
76 | 73 |
| EF312 | Highest level of vocational education and training or higher education (university/university of applied sciences) successfully completed Category 11 "Vorbereitungsdienst für den mittleren Dienst in der öffentlichen Verwaltung" (Apprenticeship for middle grades of the civil service) was a separate category in 2007; until 2006 it was included in Category 3 ["Abschluss einer Lehrausbildung..." (Completion of a vocational apprenticeship...). See also EF316, EF744, EF832, EF856 |
91a | 88a |
| EF372 | Mode of acquisition of German citizenship: Birth/naturalization/ethnic German repatriate Changes made to question and attributes |
103 | 100 |
| EF373 | Naturalization/Immigration as ethnic German repatriate: Year Question changed |
103a | 101a |
| EF401 | Main source of livelihood new response categories See also EF741, EF829, EF853 |
109 | 108 |
Methodical Notes
- The 2006 Microcensus (MC) included so-called “Jahresüberhänge” (households or persons who could not be interviewed in the previous year, mainly because they could not be reached during the survey period, and who were therefore not interviewed until the following year). The 2007 Microcensus (MC), by contrast, did not include such Jahresüberhänge.
New Concepts
Variablen im Mikrozensus 2007 und 2006 mit Änderungen
Variable |
Label / Description of change |
Question- number 2007 |
Question- number 2006 |
|---|---|---|---|
| EF1 | Federal State (Bundesland) In MC 2007, this variable was coded in accordance with the Official Municipality Key (amtlicher Gemeindeschlüssel) (as was the case up to 2004); in the 2005 and 2006 MCs it was coded in alphabetical order. |
||
| EF521 | Last job: occupation according to ISCO-88 COM When recoding from Klassifikation der Berufe (KldB) to ISCO, details of enterprise size are not available for the previous occupation. For a description of the estimation procedure, see "Klassifikation der Berufe (KldB-92) in der Signierung für den Mikrozensus - Statistisches Bundesamt, Ausgabe 1992 - in Verbindung mit dem Umsteigerschlüssel für die Internationale Standardklassifikation der Berufe zur Anwendung in der Europäischen Gemeinschaft (ISCO-88 COM)" [.pdf] (in German) |
Anonymisation
Variablen im Mikrozensus 2007 und 2006 mit Änderungen
Variable |
Label / Beschreibung der Veränderung |
Frage- nummer 2007 |
Frage- nummer 2006 |
|---|---|---|---|
| EF190 | Place of work: Country (partial aggregation of sub-regions) New aggregations in the SUF on the basis of the following criteria: 1. Date of accession to the EU, 2. Geographic location. See also EF455 |
57c | 54c |
| EF203 | Second job: Occupation (KldB92) New aggregations in the SUF to avoid aggregations across occupational groups. Where an occupational group has undergone aggregation, the (2-digit) code of the occupational group is provided. |
61 | 58 |
| EF214 | Second job: Economic sector to which the enterprise/public authority belongs (WZ03) New aggregations in the SUF to avoid aggregations across economic sectors. Where an economic sector has undergone aggregation, the (2-digit) code of the subsector is provided. |
62 | 59 |
| EF313 | Highest level of vocational education and training or higher education successfully completed: Main field (HFR03) New aggregations in the SUF on the basis of the following criteria: 1. ISCED fields of training, 2. ISCED fields of education See also EF328 |
91b | 88b |
| EF330 | Continuing general/vocational education (in the past year): hours More differentiated presentation in SUF 2007 |
95a | 92a |
| EF369 | First nationality New aggregations in the SUF on the basis of the following criteria: 1. Year of accession to the EU, 2. Geographic location See also EF374, EF733, EF755, EF821, EF845 |
101a | 98a |
Cross-sectional Data
Sampling Units
Districts
Achieved Sample Size
483595
Units Of Observation
- Persons (in private households and collective dwellings)
- Households
Units Of Analysis
- Persons
- Living arrangements
- Families
- Households
Start Date
01-01-2007
End Date
31-12-2007
Participation Mandatory
Yes
Interview Mode
- 78.1 % CAPI
- 2.7 % CATI
- 19.2 % Self-administered
Percentage Of Proxy Interviews
25.86 %
Design Weight: Target
Dwelling, Household, Persons
Design Weight: Method
The Microcensus is a single-stage, stratified cluster sample with a uniform sampling fraction for all strata. As a rule, the sampling fraction is 1 %; it applies to all sampling units (dwellings, households, persons).
Because the selection probability of the Scientific Use File (SUF) basically remains constant at 70%, design weights can be created on the basis of the inverse of the sampling fraction of the Microcensus (1 %) and the Scientific Use File (70 %): w = 1 / (0.01 * 0.7).
Non-response Weight: Method
In the Microcensus, as in all surveys, the sampling plan cannot be realised fully. Hence, undercoverage occurs in the form of non-response on the part of the households to be surveyed. Because households and their members are obliged by law to provide information for the Microcensus, non-response is due mainly to the fact that households could not be reached during the survey. Cases of non-response are corrected using the information that is available about the non-responding households.
Since 2005, the compensation factors are no longer calculated by dividing target figures by actual figures but rather by means of generalised regression estimation (calibration technique). At regional level, the following characteristics, or combinations of characteristics, are taken into account for private households: rotation quarter and new-construction stratum (federal state), 19 compensation classes (see above; regional adjustment stratum), and total private households (regional subgroup). For collective dwellings: number of persons in collective dwellings (regional subgroup).
Coverage Adjustment Weight: Method
In contrast to compensation, adjustment is carried out at person level.
Since 2005, adjustment has no longer been carried out at the level of disjointed adjustment strata but rather on a quarterly basis at different regional levels; data from the Central Register of Foreign Nationals (Ausländerzentralregister) are also used. Moreover, the same extrapolation factors are available for all members of a household. The extrapolation terms and regional units are: age groups x sex; nationality groups x sex; population group (temporary career volunteers and regular soldiers including members of the Federal Police and the Bereitschaftspolizei (riot police), persons doing military service, civilian population) (federal state); nationality groups x sex (administrative district); total population (regional adjustment stratum).
Final Weighting: Method
For the final weight a two-stage procedure is employed: In a first step the net sample of the successfully interviewed households is adjusted to the gross sample of all households to be interviewed (compensation). In a second step this gross sample is benchmarked to the update of the current population figures (adjustment). The final weights result from a combination of this two-stage procedure of compensation and adjustment. They are derived from the original data, are already multiplied with the inverse of the selection probability and extrapolated to 1000 of the population.
From 2005 onwards, in addition to the standard weighting factors for annual averages there also exist weighting factors for the quarterly samples, for the ad hoc modules and structural variables of the EU-LFS. Moreover, there are special weighting factors for supplementary programmes of the Microcensus (e.g., on the housing situation).
See [.pdf] (in German)