The CLASS variable has more than two levels

[abuhamad]

Hello All, 

I have a problem that I would to to do ttest but the log showed me that "The CLASS variable has more than two levels"

proc ttest data=work.two;
class AR;
var IN_1_AMT
title 'TTest 1 - Calculating TTEST for IN_1_AMT AR';
run;

please help for this problem

[Reeza]

Well, does your class have more than 2 levels? If so, you need proc anova instead. 

[Shivi82]

Correct as Rezza has mentioned you need to perform ANOVA test in case you have more than 2 class variables.

Also please see if ur observations are less than 30 or else you need to use Z test <this scenario is applicable only when we you have 2 class variables else ANOVA is the solution>.