Hi Christy, I think the "PredLine" functionality of *geomorph's* procD.allometry() function, following the Adams & Nistri 2010 BMC paper is a safer approach. We have to remember we are dealing with multivariate data here and a multivariate regression where the Y axis is a univariate summary, and the "line" is just an approximation of the trajectory in a multidimensional space. I think that putting such a line would mislead people and wouldn't be accurate.
Em ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Emma Sherratt, PhD. Postdoctoral Researcher in the Keogh Lab <http://biology-assets.anu.edu.au/hosted_sites/Scott/> Division of Evolution, Ecology & Genetics Research School of Biology 116 Daley Road The Australian National University Acton, ACT 2601 AUSTRALIA email: [email protected] office tel: +61 2612 54943 mob: +61 4234 19966 Twitter: @DrEmSherratt <https://twitter.com/DrEmSherratt> co-author of geomorph R package: Software website <http://geomorphr.github.io/geomorph/> | CRAN website <https://cran.r-project.org/web/packages/geomorph/> | googlegroups <https://groups.google.com/d/forum/geomorph-r-package> Caecilians are legless amphibians... * __ (\ .-. .-. /_") \\_//^\\_//^\\_// `"` `"` `"`* learn more about them here: www.emmasherratt.com/caecilians On 21 December 2016 at 15:12, Christy Hipsley <[email protected]> wrote: > Hi all, > > This is a fairly simple question, but one that I am unsure of - is it > appropriate to fit lines to plots of allometric scores, for example > regression score or common allometric component (CAC) vs size, or the first > residual shape component (RSC) vs CAC? If the scores represent individuals > from different groups or species, does it make sense to add a line of best > fit to each group to visualize trends? I've noticed in other papers that > lines are not used, so I'm wondering if this is somehow "wrong". I realize > the line itself is not the regression line, but if it's only used for > visual comparison, is that technically okay? > > Thanks for any feedback, > Christy > > -- > MORPHMET may be accessed via its webpage at http://www.morphometrics.org > --- > You received this message because you are subscribed to the Google Groups > "MORPHMET" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > -- MORPHMET may be accessed via its webpage at http://www.morphometrics.org --- You received this message because you are subscribed to the Google Groups "MORPHMET" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
