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SAMPLE is a four-digit numeric variable.


SAMPLE indicates the dataset to which the case belongs. Some surveys include data from more than one year (YEAR) and other datasets combine respondents from more than one survey (SURVEY).


SAMPLE is comparable across all years.


  • All persons.


  • 1965, 1975, 1985, 1993, 1995, 1998, 2003-2012


This variable has no flags.