What type of artifact? Is, for example, the fish bent due to preservation or is it something more complicated?
RW1 is just a PC1 so the same "rules" apply to both. -------------------- F. James Rohlf - Dept. Ecology & Evolution SUNY, Stony Brook, NY 11794-5245 > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Sent: Tuesday, March 11, 2003 4:25 PM > To: [EMAIL PROTECTED] > Subject: question on the use of relative warp scores for statistical > > > analysis > Sender: [EMAIL PROTECTED] > Precedence: bulk > > Hi everybody > > > > I was wondering if anybody had some comments on the following > dilemma. We are currently performing a tps analysis of body > shape and possible > left-right differences in a cichlid fish, and we have come across the > following situation. It appears that relative warp 1 depicts > a possible = artefact due to formalin fixation, which of > course we would like to filter out. > > 1. We would like to know whether we can treat RW1 as you > would treat PC1, depicting size, in a PCA, and thus > immediately focus on RW2 plotted against RW3. > > 2. Could we consider RW1 as an independent variable in a statistical > analysis, such as a MANCOVA, in which we would treat RW1 as a > covariable and partial warps as variables? Would it be > correct to perform this kind of analysis on the relative warp > scores, taking into account that these scores are already the > result of a statistic analysis, based on these > partial warp scores? Can we somehow tease out the "effect" of RW1? > > > Thanks in advance, > > > > Kristel Wautier > Ghent University > Department of Biology > K.-L. Ledeganckstraat 35 > 9000 Ghent > Belgium > > Tel.: +32 9 264 52 31 > Fax: +32 9 264 53 44 > > [EMAIL PROTECTED] > http://allserv.rug.ac.be/> ~kwautier/VMDB/homepage.html > == > > Replies will be sent to > list. > For more information see > http://life.bio.sunysb.edu/morph/morphmet.h> tml. == Replies will be sent to list. For more information see http://life.bio.sunysb.edu/morph/morphmet.html.
