- . webuse nlswork
- (National Longitudinal Survey of Young Women, 14-24 years old in 1968)
- . xtset idcode year
- Panel variable: idcode (unbalanced)
- Time variable: year, 68 to 88, but with gaps
- Delta: 1 unit
- . xtbalance , rang(70 88)
- (2607 observations deleted due to out of range)
- (25927 observations deleted due to discontinues)