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The release of the cumulated ISSP 'Social Inequality' modules for the years 1987, 1992, 1999 and 2009 consists of two separate datasets: ZA5890 and ZA5891.
ZA5890 contains all the cumulated variables, while the supplementary data file ZA5891 'ISSP Cumulation Social Inequality Add On' contains all those variables that could not be cumulated for various reasons. However, they can be matched easily to the cumulated file if necessary. A comprehensive overview on the contents, the structure and basic coding rules of both data files can be found in the following guide:
*: In 1987 Germany was still divided in West and East Germany and only the Western part of Germany is part of the cumulation in this year.
**: In 1992 it was Czechoslovakia (CSFR) participating in the Social Inequality module. Since in 1993 Czechoslovakia split into Slovakia and Czech Republic, the data of 1992 was assigned to the respective regions of both countries.