Covariates: how many in each analysis?

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impossible_princess
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Joined: Tue Jan 06, 2009 10:56 am

Covariates: how many in each analysis?

Postby impossible_princess » Thu Jan 08, 2009 4:44 am

Hi

In my analysis there are 4 covariates to control for.
My question is: would it be better to run an ANCOVA with all 4 as covariates, or separate them and run 4 separate analyses with 1 covariate in each??

I'm wondering as there is a research paper I found that did this, and reported the differences for each analysis with single covariates in each...

Many thanks in advance
statman
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Postby statman » Thu Jan 08, 2009 1:16 pm

You can run all at once but the interpretation might not be obvious. I don't have such data to test an see the result but go for it.

However, if you need to see the outcome based on each covariate, e.g., controlling for gender, alone the run separately.
See the note below

NOTE: Please read the Posting Guidelines and always tell us your OS, the SPSS version and information about your study and data!

Statman
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impossible_princess
Posts: 8
Joined: Tue Jan 06, 2009 10:56 am

Postby impossible_princess » Fri Jan 09, 2009 12:42 am

Thanks that helps.

:)

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