Re: [MORPHMET] Interpreting PCA results

2017-05-15 Thread N. MacLeod
I agree with Jim. However, this discussion does beg the question of what the status of landmark, semilandmark, or indeed pixel brightness configurations within multivariate spaces is? Very similar spaces have been used in the area of theoretical morphology to conduct various sorts of

RE: [MORPHMET] Interpreting PCA results

2017-05-15 Thread F. James Rohlf
mess...@gmail.com> Subject: RE: [MORPHMET] Interpreting PCA results Dear all, I read interesting comments and the attached manuscript as well. I find David question us interesting. If any one could answer David question in a simple way? I am quoting his question below?. "What I do not

Re: [MORPHMET] Interpreting PCA results

2017-05-15 Thread mahendiran mylswamy
>> >> & Research Professor. Dept. of Anthropology >> >> Stony Brook University 11794-4364 >> >> WWW: http://life.bio.sunysb.edu/morph/rohlf >> >> P Please consider the environment before printing this email >> >> >> >

Re: [MORPHMET] Interpreting PCA results

2017-05-15 Thread Carmelo Fruciano
unday, May 14, 2017 7:28 PM *To:* dsbriss_dmd <orthofl...@gmail.com <mailto:orthofl...@gmail.com>> *Cc:* MORPHMET <morphmet@morphometrics.org <mailto:morphmet@morphometrics.org>> *Subject:* Re: [MORPHMET] Interpreting PCA results Dear David, Grea

RE: [MORPHMET] Interpreting PCA results

2017-05-15 Thread mahendiran mylswamy
t:* Sunday, May 14, 2017 7:28 PM > *To:* dsbriss_dmd <orthofl...@gmail.com> > *Cc:* MORPHMET <morphmet@morphometrics.org> > *Subject:* Re: [MORPHMET] Interpreting PCA results > > > > Dear David, > > Great question! I disagree with the statement that the sam

RE: [MORPHMET] Interpreting PCA results

2017-05-14 Thread F. James Rohlf
HMET <morphmet@morphometrics.org> Subject: Re: [MORPHMET] Interpreting PCA results Dear David, Great question! I disagree with the statement that the samples' variance in shape space is not biologically real or, perhaps more accurately, is less real than the variance in any other spa

Re: [MORPHMET] Interpreting PCA results

2017-05-14 Thread K. James Soda
Dear David, Great question! I disagree with the statement that the samples' variance in shape space is not biologically real or, perhaps more accurately, is less real than the variance in any other space. As far as I see it, the basic strategy in any biostatistical study, be it GM or otherwise,

[MORPHMET] Interpreting PCA results

2017-05-14 Thread dsbriss_dmd
Good afternoon all, I have a question about interpretation of PCs. I have come across several articles in orthodontic literature having to do with morphometric analysis of sagittal cephalograms that discuss warping a Procrustes analysis along a principal component axis. Essentially the