PROC MEANS class specify null value

[lizzy28]

Hi everyone,

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;

   class flag;

   var cost;

run;

Thank you!

Lizi

[Reeza]

Wouldn't you use PROC TTEST and H0 on the TTEST statement?

[Reeza · Accepted solution]

Or PROC UNIVARIATE, which is closer to what you want.

---

proc univariate data=sashelp.class mu0=5;
class sex;
var age;
run;

[ballardw]

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;