Hi!

I would like some advice on how to analyze a manipulation check regarding the effect size (cohens d and cohens f2).
Participants got randomly assignet to two groups. Participants could rank the manipulation check question on a scale from 1 to 5. The "correct" answer for group 1 was "1" and for group 2 it was "5".

I do not know how to analyze the effect size in stata in order to know what data and how much data I need to delete.

Thanks in advance.
Andreas