-------- Original Message --------
Subject: pooled regression in MorphoJ
Date: Tue, 29 Nov 2011 12:46:05 +0000
From: <[email protected]>
To: <[email protected]>
Dear Friends and Collaegues
I am trying to reproduce the pooled regression results of MorphoJ in
another program, but have been unsuccessful so far. I suspect this is
because I do not truly understand how MorphoJ does the calculations for
pooling the groups. So, I would appreciate your help very much.
I am trying to regress the Procrustes coordinates onto Log Centroid Size
and am mostly interested in the regression residuals. The first thing I
tried was the following. I subtracted the mean value for each Procrustes
coordinate for each group separately and then let SPSS and Past perform
a regression analysis on these. Afterwards I added the mean value for
each Procrustes coordinate in each group back to the regression
residuals. SPSS and Past gave exactly the same result, but both are
slightly different from the regression residuals given by MorphoJ.
I have also tried to do a MANCOVA in SPSS on the Procrustes coordinates,
but the resulting regression residuals were more different from those
produced by MorphoJ than when using the method described above.
I would very much appreciate it if somebody could explain to me what I
should do to replicate the results of MorphoJ doing a pooled regression,
or point me to another program that is capable to doing a pooled
regression analysis.
Thanking you in advance.
Best wishes,
Anneke van Heteren
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