capture log close 
set logtype text, 
log using example4.txt, replace 
clear 
set memory 100m 
set more on

use wage2, clear
describe

quietly regress lwage educ
estimates store model1
estat vce
quietly regress lwage educ exper
estimates store model2
estat vce
quietly regress lwage educ exper IQ
estimates store model3
estat vce
quietly regress lwage educ exper IQ age
estimates store model4
estat vce
estimates table model1 model2 model3 model4, stat(r2 r2_a rmse N) b(%7.0g) se(%7.3g) t(%4.3f) p(%4.3f)

log close 
exit