-------- Original Message --------
Subject: Re: correcting for body size
Date: Wed, 16 May 2012 09:16:56 -0400
From: Guillermo CASSINI <gcass...@unlu.edu.ar>
To: morphmet@morphometrics.org
hello Saad,
These two variables, eye area and body mass, grows
at squared and cube rates respectively. So you need to log-transform
both variables to convert their relationship from a potential function
(Y=a*W^b) to a straight linear function (LogY=log a + b logW) also this
transformation reduce heteroscedasticity and fit the data to normal
distribution.
Regards,
Guillermo
El 16/05/2012 03:59, morphmet escribió:
-------- 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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