# PS7.3, to duplicate Table 7.2 
open data7-3
ols price const sqft
# This is model E in Table 7.2 
ols price const sqft bedrms baths pool famroom firepl
# omit variable with highest pvalue, one at a time 
omit baths
omit bedrms
omit firepl
# Model F 
omit famroom
# rerun full model for Wald test 
ols price const sqft bedrms baths pool famroom firepl
# Wald F-statistic for Models E and F is provided 
omit bedrms baths famroom firepl