08-23-2017 12:25 PM
I am trying to do ttest of two groups to see if the group means are different from a fixed value. How can I specify the null value in PROC MEANS ttest?
proc means data=mydata t probt;
08-23-2017 12:40 PM
I would suggest using Proc TTest if you need to specify a value for the null hyposis.
To test difference of means between the level of the class variable (if two levels)
proc ttest data=mydata h0=<null hypothesis value>; class flag; var cost; run;
To test if the mean of each level of the class variable has mean of xx
proc ttest data=mydata h0=<null hypothesis value>; by flag; var cost; run;
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