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Subject: Relative warp question
Date: Mon, 1 Feb 2010 09:29:50 -0500
From: Richards Paul <[email protected]>
To: <[email protected]>
Hi , I am applying relative warp analysis to a population of land
snails, but I am new to all the theory and methods. I’m doing a
preliminary analysis to see if shell colour (i.e. dark, intermediate,
light) is associated with differences in shape. I have run the relative
warp analysis using tpsrelw, but have a few queries about using the
output and potential analysis.
RW1 to 3 appear to describe the apparent shape variance I am interested
in (i.e. high spired vs flat and aperture size). Do the relative warps
correspond directly to the identical partial warps in the weight matrix
(e.g. RW1 scores column corresponds to the first variable column in the
weight matrix)? If so could I take the first variable in the weight
matrix (assuming it corresponds to RW1) and perform a T test just for
this variable between my dark and light colour groups? I have tried
using a MANOVA approach, but because these samples weren’t collected
specifically with this analysis in mind I am lacking enough samples in
each of my colour groups to get sufficient power, but I think a T test
on a per variable basis should be OK in the first instance.
I would be most grateful for any advice, and apologise if I have
overlooked something obvious!
Thanks, Paul
----------------
Paul Richards
School of Biology
University of Nottingham
University Park
NG7 2RD
+44 (0)115 8213128
[email protected]
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