The CLASS variable has more than two levels

[yael]

Hello

I am trying to check t test while I have a variables dl dm dn (profit vs assets in 3 variations) while my class is az. The az is dummy variable with 0 or 1 (1 is a family and 0 is not a family).

This is my project:

proc ttest data=sasuser.sasfile120416;

class az;

var dl dm dn;

run;

And the answer I got in log is

ERROR: The CLASS variable has more than two levels.

I checked and the az is only 1 and 0, so what it could be?

Thanks for any help!

[Reeza · Accepted solution]

Any missing values? Is a format applied to variable. 

Post output from following:

proc freq data=sasuser.sasfile120416;
Format az;
Table az/missing
Run;

[FreelanceReinh]

@Reeza: Observations with missing values of the CLASS variable would be omitted from the calculations. Also, class levels are determined from the formatted values of the CLASS variable.

@yael: Is az a numeric variable or a character variable? Does it have a format (see PROC CONTENTS output)?