Thank you, Emma. I definitely wouldn't want any fairy casualties caused by my data analyses!!!
On Tuesday, February 10, 2015 at 2:38:43 PM UTC-8, Emma Sherratt wrote: > > Gabi, > > If you are interested in the relationship between a set of shape variables > (your Procrustes coordinates) and a single variable (e.g. precipitation), > you could use a Multivariate Regression in MorphoJ, or better, a Procrustes > ANOVA (which is procD.lm() in geomorph. Not sure if the Procrustes ANOVA in > morphoJ can do this...). If you have a set of environmental variables and > wish for them to be treated together, maybe 2 block partial least squares > can be used. > I would NOT use a single PC axis in a bivariate analysis of correlation > with an environmental variable. Use all the shape variables and a > Multidimensional method such as multivariate regression or Procrustes > ANOVA. > > Good luck! > > Emma > > P.S. It my own personal opinion, but every time shape data is reduced to a > few PC axes and used in an analysis, a fairy dies... ;) > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > Emma Sherratt, PhD. > > Lecturer in Zoology, > Zoology Division, School of Environmental and Rural Science, > Room L120 Bldg C02, > University of New England, > Armidale, NSW, Australia, 2351 > Tel: +61 2 6773 5041 > email: emma.s...@une.edu.au <javascript:> > > Caecilians are legless amphibians... > > * __ > (\ .-. .-. /_") > \\_//^\\_//^\\_// > `"` `"` `"`* > > learn more about them here: www.emmasherratt.com/caecilians > > > > > On 11 February 2015 at 09:28, gnavas <gna...@mlml.calstate.edu > <javascript:>> wrote: > >> Hi guys, >> >> Thanks a ton for your quick responses. Emma, the CV scores were so >> tempting to use for comparison to other variables...What would you suggest >> would be a more appropriate index to use in order to compare the shape >> ordination results to say, environmental variables, such as sediment size >> (I am studying clam morphology differences)? >> >> On Tuesday, February 10, 2015 at 2:00:04 PM UTC-8, Emma Sherratt wrote: >>> >>> Gabi, >>> >>> While Michael is correct i how you can export the CV scores from >>> MorphoJ, I would highly recommend against exporting the CV scores to plot >>> against other parameters. The reason being that CVA should not be used like >>> Principal Components Analysis. CVA axes should be used for inspecting the >>> data for the aspects of shape that delimit and discriminate between two or >>> more groups. Not as reduced axes for use in correlation tests. >>> >>> Emma >>> >>> >>> >>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>> >>> Emma Sherratt, PhD. >>> >>> Lecturer in Zoology, >>> Zoology Division, School of Environmental and Rural Science, >>> Room L120 Bldg C02, >>> University of New England, >>> Armidale, NSW, Australia, 2351 >>> Tel: +61 2 6773 5041 >>> email: emma.s...@une.edu.au >>> >>> Caecilians are legless amphibians... >>> >>> * __ >>> (\ .-. .-. /_") >>> \\_//^\\_//^\\_// >>> `"` `"` `"`* >>> >>> learn more about them here: www.emmasherratt.com/caecilians >>> >>> >>> >>> >>> On 11 February 2015 at 08:33, gnavas <gna...@mlml.calstate.edu> wrote: >>> >>>> Dear Morphometrics Wizards, >>>> >>>> I have 2 questions for which I am hoping to get help on: >>>> >>>> Question 1. CVA analysis: I have 6 sites. Within each site I have at >>>> least 22 samples. When I ran a CVA comparison on these 6 sites in Morpho >>>> J. >>>> I was hoping to find a way to get an actual value for each of my samples >>>> that plotted. So, for instance, CV1 values for each specimen, and the same >>>> for CV2. In the results tab, I can only find data relevant to my landmarks >>>> and canonical variates coefficients relating to lanmarks. >>>> >>>> I would love to figure out a way to export my CV1 and CV2 values for >>>> each specimen to then plot that against other parameters that may be >>>> effecting shape at those 2 or more canonical variate axes. Has anyone run >>>> into this problem, and found a solution? >>>> >>>> Question 2. Discriminant Analysis: >>>> Again, 6 sites with 22 samples, but this time I was only able to >>>> compare 2 sites at a time. Has anyone ever been able to run 1 site against >>>> all remaining sites? It would be great to get an idea of how my sites >>>> compare to all others, rather than to just one other at a time. I suspect >>>> I >>>> have to play with my classifier variables, but I am not sure how to go >>>> about that. At this point, I have made 1 classifier variable that allows >>>> me >>>> to distinguish the different sites. >>>> >>>> If any of you have run into this or simply know how to do this, please >>>> let me know. I am also happy to give more detail on my study if that would >>>> help? >>>> >>>> Thank you in advance! >>>> Gabi >>>> >>>> -- >>>> MORPHMET may be accessed via its webpage at >>>> http://www.morphometrics.org >>>> >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to morphmet+u...@morphometrics.org. >>>> >>> >>> -- >> MORPHMET may be accessed via its webpage at http://www.morphometrics.org >> >> To unsubscribe from this group and stop receiving emails from it, send an >> email to morphmet+u...@morphometrics.org <javascript:>. >> > > -- MORPHMET may be accessed via its webpage at http://www.morphometrics.org To unsubscribe from this group and stop receiving emails from it, send an email to morphmet+unsubscr...@morphometrics.org.
