* PS5.5, using DATA4-6, SHAZAM command file for second appl. in Sec 5.4
SAMPLE 1 58
READ(data4-6) POVRATE URB FAMSIZE UNEMP HIGHSCHL COLLEGE MEDINC
STAT URB FAMSIZE UNEMP HIGHSCHL COLLEGE MEDINC / PCOR
*
*  MODEL A  --  most general specification *
*
OLS POVRATE URB FAMSIZE UNEMP HIGHSCHL COLLEGE MEDINC
OLS POVRATE URB FAMSIZE HIGHSCHL COLLEGE MEDINC
*
*  MODEL B after omitting the two variables with insignificant coeff.
*
OLS POVRATE FAMSIZE HIGHSCHL COLLEGE MEDINC
*
*  MODEL C  --  omit COLLEGE which has the wrong sign
*
OLS POVRATE FAMSIZE HIGHSCHL MEDINC
*
*  MODEL D  -- replace MEDINC by COLLEGE
OLS POVRATE FAMSIZE HIGHSCHL COLLEGE
*
* Relate MEDINC to its determinants and confirm multicollinearity
* 
OLS MEDINC FAMSIZE UNEMP HIGHSCHL COLLEGE 
DELETE / ALL
STOP