I am looking at OCC in 2000(5%)data. For OCC, 000=N/A,992=unemployed. In my case, by tab OCC, the number of observations with “000” values is 1,100,990, the number of observations with "992"values is 35,340.

However, by tab LABFORCE, the number of observations “not in labor force” is 2,189,717.

My question is that why these variables give different numbers for people who are “not in labor force”? Thanks.