-------- Original Message -------- Subject: Re: Concensus forms in Morpho J Date: Thu, 19 Mar 2009 02:02:43 -0700 (PDT) From: Chris Klingenberg <[email protected]> Reply-To: [email protected] Organization: University of Manchester To: [email protected] References: <[email protected]> Hi Chikako There is no problem with MorphoJ and negative values in the input data, except for -9999, which is interpreted as a missing value. The average shape is the same as the consensus shape (not form: size is removed -- the consensus is scaled so that it has centroid size 1.0). Normally, I would do the whole thing the other way round: start out with the Procrustes fit of the whole sample, then subdivide into groups and compare their averages. Unless the variation you are looking at is *extremely* large, both approaches will give similar results. Best wishes, Chris morphmet wrote:
-------- Original Message -------- Subject: Concensus forms in Morpho J Date: Wed, 18 Mar 2009 14:10:46 -0700 (PDT) From: Chikako Matsuda <[email protected]> To: [email protected] Hi, I analyzed a 3D consensus form for 42 populations of a particular fish species using Morpho J. (I am assuming the numbers listed below "average shape" under the results tab after performing a Procrustes fit is providing me with the landmark coordinates for the consensus form.) I would now like to figure out what the global consensus form is using the population consensus forms. How do I do this? (I cannot just input the landmark coordinates for the population consensus forms to get a global consensus form because I believe Morpho J doesn't accept negative values and many of my landmark coordinate values for the population consensus forms are negative.) Any help would be much appreciated. Thank you, Chikako M. [email protected] <mailto:[email protected]>
-- *************************************************************** Christian Peter Klingenberg Faculty of Life Sciences The University of Manchester Michael Smith Building Oxford Road Manchester M13 9PT United Kingdom Telephone: +44 161 275 3899 Fax: +44 161 275 5082 E-mail: [email protected] Web: http://www.flywings.org.uk Skype: chris_klingenberg *************************************************************** -- Replies will be sent to the list. For more information visit http://www.morphometrics.org
