Report , News of 11 July 2014

Integration of FiD into the SOEP

Since financing of the study Families in Germany (Familien in Deutschland, FiD) through the German Federal Ministry of Family Affairs (BMFSFJ) has ended after four waves, the households surveyed in FiD will be included in the SOEP as of 2014. To justify this, the sensitivity of the combination of the samples was tested, comparing the distributions of selected variables in the SOEP with their distributions in the combined sample of both SOEP and FiD. Both households and individuals were used as units of analysis and selected variables were included, among them migration status, education and employment, and financial parameters such as poverty rate, income, and rent. Categorical variables were compared using bar plots, metric variables were presented in dot plots, checking means and confidence intervals against each other. Data were analyzed separately for 2010, 2011, and 2012 and also for East and West Germany where suitable.

The analysis showed that there are no considerable differences between the distributions of selected variables in SOEP and in SOEP plus FiD. Confidence intervals in both samples overlapped for all tested variables, implying that the data distribution is hardly sensitive to the combination of both samples. However, since FiD contains a large number of families with children, the integration favorably reduces the variance of affected variables, such as the poverty rate of children under three.

Overall the analysis showed that the integration of FiD into SOEP is justified. All results can be downloaded here | PDF, 264.28 KB .

FiD data from all waves (including wave 4) is available upon request (see FiD homepage).