Variables in the dataset nlsymen81_88.txt:

1 - Worker id 
2 - Log-wage 
3 - Union 
4 - Lag-union1
5 - Schooling
6 - log-experience
7 - Rural dummy
8 - Married dummy
9 - Health dummy
10 - 3 region dummies for region NE, NC, and S
11 - 11 industry dummies for ag min con trad tra fin bus per ent man pro
13 - 7 year dummies yr2-yr8
12 - 8 occupation dummies


Files in the folder panel_selection_fe_short_sample_nov_04_2006

1 - panel_selection_fe_short_sample_nov_04_2006.m: main program
2 - The rest are auxiliary functions called by the main program