09-15-2017 03:43 PM
I have a question for my t-test code listed below. After I ran my code, I got an error message as below. I checked the variable flag for class statement. It is 2-category variable. Could anyone give me some hint? Thanks so much!
proc ttest data=mydata;
ERROR: N, MEAN, or STD value occurs twice in class or by group.
09-15-2017 04:38 PM - edited 09-16-2017 02:17 PM
Run proc print and proc contents on your data set. Look at the results. Is it a TYPE=SUMMARY data set (or some other special type)? Does it have the right stuff ?
proc means data=sashelp.class; var age; class sex; output out=m; run; proc print; run; proc contents varnum; run; proc ttest data=m; var age; class sex; run;