* Panel Data Methods 
* Reference: Chapter 14 of
*   Jeffrey M. Wooldridge, Introductory Econometrics: A Modern Approach,
*   South-Western College Publishing, 2000.
PAR 5000
SAMPLE 1 4360
READ (WAGEPAN.shd) nr year black exper hispan hours married &
  occ1 occ2 occ3 occ4 occ5 occ6 occ7 occ8 occ9 &
  educ union lwage d81 d82 d83 d84 d85 d86 d87 expersq 

* Example 14.4 - A Wage Equation using Panel Data, pp. 451-452.
* Pooled OLS 
POOL lwage educ black hispan exper expersq married union &
    d81 d82 d83 d84 d85 d86 d87 / NTIME=8 OLS

* Fixed Effects
POOL lwage expersq married union &
    d81 d82 d83 d84 d85 d86 d87 / NTIME=8 FIXED OLS
STOP