Bookstein or GPA for "combs"

[mint...@gmail.com]

A quick question about what's appropriate for LMs placed using a fan/comb like in IMP's MakeFan...I'm helping a colleague who used MakeFan to place a fan for landmarking using two anchored LMs; they also didn't capture a scale so can only look at shape not form. Would this dataset be better analyzed with Bookstein coordinates or with Procrustes? TIA

[mint...@gmail.com]

FWIW, I would just GPA it normally, but the colleague asked about BC because the fan/comb is based on the two point registration.

[Adams, Dean [EEOB]]

Still GPA

-- 
Dr. Dean C. Adams
Distinguished Professor
Department of Ecology, Evolution, and Organismal Biology
Iowa State University
www.public.iastate.edu/~dcadams/
phone: 515-294-3834

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From: geomorph-...@googlegroups.com <geomorph-...@googlegroups.com> on behalf of mint...@gmail.com <mint...@gmail.com>
Sent: Thursday, June 19, 2025 7:48 PM
To: geomorph R package <geomorph-...@googlegroups.com>
Subject: [geomorph-r-package] Re: Bookstein or GPA for "combs"

 

FWIW, I would just GPA it normally, but the colleague asked about BC because the fan/comb is based on the two point registration.

On Thursday, June 19, 2025 at 8:11:37 PM UTC-4 mint...@gmail.com wrote:

A quick question about what's appropriate for LMs placed using a fan/comb like in IMP's MakeFan...I'm helping a colleague who used MakeFan to place a fan for landmarking using two anchored LMs; they also didn't capture a scale so can only look at shape not form. Would this dataset be better analyzed with Bookstein coordinates or with Procrustes? TIA

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