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I have two IVs (personality and teaching method) and a DV of self-esteem. I'm running a pretest/posttest ANCOVA (as I can't randomise) and am not sure if the DV and covariate can be the same. Can I use the same self-esteem scale to measure both the DV and the covariate, before and after intervention?

kjetil b halvorsen
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Anne
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    Could you edit your question to be more precise - now it is not totally clear what is your procedure and how does it relate to the question title... – Tim Dec 01 '15 at 10:45
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    Welcome to Cross Validated! It's not clear, but possibly related: [Is it valid to include a baseline measure as control variable when testing the effect of an independent variable on change scores?](http://stats.stackexchange.com/q/15713/17230). – Scortchi - Reinstate Monica Dec 01 '15 at 10:49
  • OK, sorry, have done. – Anne Dec 01 '15 at 10:53

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