* Setup
sysuse auto
* Fit a linear regression
regress mpg weight foreign
* Fit a better linear regression, from a physics standpoint
gen gp100m = 100/mpg
regress gp100m weight foreign
* Obtain beta coefficients without refitting model
regress, beta
* Suppress intercept term
regress weight length, noconstant
* Model already has constant
regress weight length bn.foreign, hascons