|Summary for Variable Group: Comparable sample|
|The Comparable sample variable group contains ten binary variables (one for each component survey) to allow users to generate samples that are consistent across time. With few exceptions, the sampling frames become more inclusive over time, with the earliest surveys having the most restrictive sample. Comparable sample ("CS") variables are equal to 1 if the respondent would have been included in the sample in that year. For example, a sample that is consistent with the 1955 GAF would include only those respondents who would have been included in a survey using the sample restrictions for the 1955 GAF, i.e., those for whom IFSS_CS1955=1. A consistent sample spanning multiple surveys would include only those respondents with a value of 1 for the comparable sample variable for each survey. For example, a consistent sample from 1965 to 1976 would contain only respondents for whom IFSS_CS1965=1, IFSS_CS1970=1, IFSS_CS1973=1 and IFSS_CS1976=1.
|1970 NFS comparable sample|
|1976 NSFG: Couple File|
|R7_CM||R7||1976 NSFG: Couple File|
|MARSTAT||N/A||1976 NSFG: Couple File|
|A7_CM||A7||1976 NSFG: Couple File|
|This variable indicates whether the respondent would have been included in the 1970 NFS sampling frame.
General Comparability Notes
|The universe listed in the ICSPR documentation for the 1970 NFS is "Ever-married women, born after July 1, 1925." IFSS_CS1970 is equal to 1 for all ever-married (currently married, divorced, widowed, or separated) women between the ages of 14 and 45, and 0 for all other women. The youngest woman in the 1970 sample was 14 at the time of interview, and the oldest was 45, so IFSS preserved that in IFSS_CS1970.|