For directions on reading the variable description see Data Dictionary Introduction.

Availability: 
 

1850	1860	1870	1880	1900	1910	1920	1940	1950	1960	1970	1980	1990
							SL	SL

Universe: 
Sample-line persons. 

Codes and Frequencies

Description/Comparability: 
SELFWTSL indicates whether or not each 1940 sample-line person is contained in a self-weighting sample. Selecting cases in the self-weighting sample yields a "flat" sample that does not require weights. See the household-record variable SELFWTHH and Chapter 2, "Sampling Design."

This variable is fully comparable among census years. Note, however, that all sample-line persons in 1950 are weighted equally, therefore, they are all part of the self-weighting sample.