Options ls=78 nodate;

FILENAME instore 'beefpork.dat';

DATA one;
INFILE instore DLM='09'x DSD MISSOVER;
INPUT year  pbe cbe  ppo cpo pfo dinc cfo rdinc rfp;

PROC REG CORR DATA=one;
  MODEL pbe = cbe pfo dinc cfo rdinc / COLLIN VIF;
TITLE '5 regressor model test the beef price';

PROC REG CORR DATA=one;
  MODEL pbe = cbe cfo rfp year / COLLINOINT VIF;
TITLE 'Another candidate model';

PROC REG CORR DATA=one;
  MODEL pbe = cbe pfo cfo rdinc / COLLIN VIF;
TITLE '4 regressor model';

Submit to see output