topic Re: PROC MEANS class specify null value in SAS Procedures

PROC MEANS class specify null value

lizzy28 — Wed, 23 Aug 2017 16:25:12 GMT

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

Re: PROC MEANS class specify null value

Reeza — Wed, 23 Aug 2017 16:35:20 GMT

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

Re: PROC MEANS class specify null value

Reeza — Wed, 23 Aug 2017 16:38:24 GMT

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


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

Re: PROC MEANS class specify null value

ballardw — Wed, 23 Aug 2017 16:40:49 GMT

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;