PROC REG DATA=swiss OUTEST=fits;
  MODEL Fertility = Agriculture Examination Education Catholic InfantMortality / ADJRSQ CP AIC BIC PRESS;
RUN;
QUIT;

PROC REG DATA=swiss;
  MODEL Fertility = Agriculture Examination Education Catholic InfantMortality / SELECTION=CP;
RUN;

PROC REG DATA=swiss;
  MODEL Fertility = Agriculture Examination Education Catholic InfantMortality / SELECTION=FORWARD;
RUN;