6-4 Other Aspects of Regression

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6-4 Other Aspects of Regression OPTIONS NODATE NOOVP NONUMBER; DATA SALES; INFILE 'C:\Users\korea\Desktop\Working Folder 2017\imen214-stats\ch06\data\sales.dat'; INPUT SALES TIME POTENT ADVERT SHARE CHANGE ACCOUNTS WORKLOAD RATING; PROC CORR DATA=SALES; VAR SALES; WITH TIME POTENT ADVERT SHARE CHANGE ACCOUNTS WORKLOAD RATING; TITLE 'CORRELATIONS OF DEPENDENT WITH INDENDENTS'; VAR TIME POTENT ADVERT SHARE CHANGE ACCOUNTS WORKLOAD RATING; TITLE 'CORRELATIONS BETWEEN INDEPENDENT VARIABLES'; PROC REG DATA=SALES; MODEL SALES=TIME POTENT ADVERT SHARE CHANGE ACCOUNTS WORKLOAD RATING/VIF R; TITLE 'REGRESSION MODEL WITH ALL VARIABLES'; PROC RSQUARE DATA=SALES CP; MODEL SALES=TIME POTENT ADVERT SHARE CHANGE ACCOUNTS WORKLOAD RATING /ADJRSQ RMSE SSE SELECT=10; TITLE 'ALL POSSIBLE REGRESSIONS'; MODEL SALES=TIME POTENT ADVERT SHARE CHANGE ACCOUNTS WORKLOAD RATING /selection=FORWARD slentry=0.25; TITLE 'STEPWISE REGRESSION USING FORWARD SELECTION'; MODEL SALES=TIME POTENT ADVERT SHARE CHANGE ACCOUNTS WORKLOAD RATING /selection=BACKWARD; TITLE 'STEPWISE REGRESSION USING BACKWARD ELIMINATION'; /selection=stepwise; TITLE 'STEPWISE REGRESSION THE STEPWISE TECHNIQUE'; MODEL SALES=POTENT ADVERT SHARE ACCOUNTS/R; MODEL SALES=POTENT ADVERT SHARE CHANGE ACCOUNTS/R; MODEL SALES=TIME POTENT ADVERT SHARE CHANGE/R; MODEL SALES=TIME POTENT ADVERT SHARE ACCOUNTS/R; MODEL SALES=TIME POTENT ADVERT SHARE CHANGE WORKLOAD/R; RUN; QUIT;