-------- Original Message -------- Subject: Re: correcting for body size Date: Wed, 16 May 2012 08:30:33 -0400 From: Kim van der Linde <k...@kimvdlinde.com> To: morphmet@morphometrics.org CC: morphmet <morphmet_modera...@morphometrics.org> You effectively ask for an allometric regression. 1. take the square root of the eye area 2. log transform the measurements 3. use a type 2 regression (major axis, reduced major axis) 4. calculate the distance between the point and the regression line This should do it. Kim On 5/16/2012 2:59 AM, morphmet wrote:
-------- Original Message -------- Subject: correcting for body size Date: Tue, 15 May 2012 11:03:28 -0400 From: Saad Arif <arifs...@gmail.com> To: morphmet@morphometrics.org Hello all, I have linear measurements for eye area and body size in Drosophila. I want to get residuals for eye area by regressing it on body size. Both variables appear to have a straight-line relationship. my question is: do i need to square my body size measurement before i regress it to eye area even if they are both seemingly linearly related? Any response would be appreciated! Thanks in advance. Saad
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