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Study: MZ 2007

Additional Programs

  • 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% )

Specific Features

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

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

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)


Variablen im Mikrozensus 2007 und 2006 mit Änderungen

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

Year Specific Documentation

  • Recoding of Double Identifiers in the SUF 2007 [.do] [.spss] [.sas]
  • Microcensus Scientific Use File 2007 Documentation and Data Preparation [in German] [.pdf]

Target Sample Size

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

Data Collection

Start Date


End Date


Participation Mandatory


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)