For more detailed information on the individual modules please have a look at the documentations for ZA1680 Social Inequality I ISSP 1987 ZA2310 Social Inequality II ISSP 1992 ZA3430 Social Inequality III ISSP 1999 ZA5400 Social Inequality IV ISSP 2009 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 The main dataset ZA5890 contains all the cumulated variables while the supplementary data file ZA5891 contains those variables that could not be cumulated for various reasons
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