ANCOVA (aoctool) with 2 or more covariates

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Right Grievous
Right Grievous on 25 Nov 2013
Edited: Adam Danz on 2 Jan 2022
Is there any way to run an ANCOVA in Matlab with more than one covariate? The aoctool function only seems able to accept an IV a DV and one covariate but I have 2, possibly 3 covariates.
I can't seem to find if this is possible using aoctool or if there is another way to do it in Matlab...
As always, any help would be greatly appreciated,
Rod.

Accepted Answer

Right Grievous
Right Grievous on 2 Dec 2013
I'll answer my own question... again.
aoctool can't take more than one covariate and there's no way round it. However, there is a file on the file exchange called MANCOVAN which can do all sorts of things - including an ANCOVA with more than one covariate.
That function does not output the stats array required by multcompare though, so really it's a bit of a dead end. Matlab really sucks sometimes.
  5 Comments
Alex Sabrekov
Alex Sabrekov on 1 Jan 2022
But the bad thing is anovan() doesn't give enough statistics to compare slopes and intersepts. It can give you just coefficients for all terms. So if you have more than one categorial IV or covariate, you can't obtain detail statics on slopes in matlab, because aoctool() performs analysis with just one categorial IV and one covariate.
It is a pity for me as a matlab patriot, since ANCOVA is a popular instrument.

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