[Note: you are recommended to copy and paste the code below onto your SAS Studio for better viewing]
Model Answer
proc sort data=loyalty;
by recency frequency;
run;
** Coding Project **;
ods output statistics=stat ttests=ttests equality=equa;
proc ttest data=loyalty;
class group;
var spent;
by recency frequency;
run;
data stat2;
set stat;
if class = "Diff (1-2)";
keep recency frequency class mean;
run;
data combine;
merge stat2 ttests equa;
by recency frequency;
if probf < 0.05 and variances = "Equal" then delete;
else if probf > 0.05 and variances = "Unequal" then delete;
if probt<0.05;
keep recency frequency mean class probt;
run;
