Should I run a multivariate GLM or two univariate GLMs in SPSS?

05 January 2023 1 8K Report

Hi. Please can anyone help?

I have two dependent variables, a length and a width measurement, that are related (spearmans r = 0.54). I have three fixed factors (dog breed, assessor and trial group) and three covariates (age, days since intervention and height*weight).

I was planning on running a multivariate GLM in SPSS but despite lots of reading and chatting with my supervisors, I am still not clear whether this is suitable for my data. Please can someone help?

I followed this tutorial https://www.youtube.com/watch?v=J0FeyWJgHiU but included all my two way interactions between fixed factors and covariates. Some of them were significant. Does this mean that the assumptions are violated and I should not run the multivariate model?

Thanks in advance for any assistance!

David Eugene Booth

Read this paper before you do anything else. David Booth

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