PROC REG < options > ; MODEL dependents=< regressors > < / options > ; BY variables ; FREQ variable ; ID variables ; VAR variables ; WEIGHT variable ; OUTPUT < OUT=SAS-data-set > keyword=names < ... keyword=names > ; PLOT < yvariable*xvariable > < =symbol> < ...yvariable*xvariable> < =symbol> < / options > ; TEST equation,< , ...,equation> < / option > ; RUN; QUIT;