Data described in Stata Reference Manual S-Z version 7, and used in many examples of cross-section time-series (xt) commands. 26,200 person-year observations on 10 variables, longitudinal over 1970-1988 (with gaps).

Data described in Stata Reference Manual S-Z version 7, and used in many examples of cross-section time-series (xt) commands. 28,534 person-year observations on 21 variables, longitudinal over 1968-1988 (with gaps).