topic Re: The CLASS variable has more than two levels in Statistical Procedures

The CLASS variable has more than two levels

abuhamad — Thu, 21 Apr 2016 02:30:45 GMT

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

Re: The CLASS variable has more than two levels

Reeza — Thu, 21 Apr 2016 02:43:22 GMT

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

Re: The CLASS variable has more than two levels

Shivi82 — Sat, 23 Apr 2016 11:23:58 GMT

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>.