Hello everyone,

I was wondering if anyone knows how to test for differences in characteristics for people that dropped out of the study and people that remained? I know that you should use a chi squared for categorical/binary variables and a t-test for continuous, but when I try to test the group that did not drop out with the group that dropped out using tab ...., chi, stata says there are no observations? Even though there should be 7000. Hopefully, someone can help me with this.
Thank you.

Elvire Landstra