----- Forwarded
message from mahdi
rabie
Date: Mon, 18 Jun 2012
02:41:32 -0400
From: mahdi rabie
Reply-To: mahdi rabie
Subject: problem with
RMA regression
To: "[email protected]"
Dear All
I have a problem with RMA
regression (Reduced Major Axis regression) and would be very grateful if
somebody help me.
I'm studying on allometry of somatic and sexual
traits of two Noctuid moths. I want to calculate slope B of regression line for
log transformed data for calculation of kind of allometry relationship (isometry
or negative allometry or positive allometry ).
I first
calculated it by OLS regression and found negative allometry for some sexual
traits and isometry and negative allometry for somatics. Again, I calculated B
by method RMA by using RMA Software. I found isometry for often somatic traits
and positive for some of them and positive allometry for sexual traits ! It is
strange results ! as in literature all authors report negative allometry and
isometry for sexual traits. I don't know my calculations are incorrect ? or
software is corrupted ? or, I found a new phenomenon (positive allometry
for sexual traits)?
Thank
You
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