| http://www.w3.org/ns/prov#value | - Namely, the SPD panel universe consists of persons (including children) residing in the United States households and persons living in group quarters in March 1993. (Note that persons living in military barracks and institutions, such as prisons and nursing homes, are excluded.) The SPD panel universe is represented by combining the SIPP Panels 1992 and 1993 into one sample.
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