Re: [MORPHMET] Question about MorphoJ/Landmarking
Hi Sara, In the Preliminaries menu in MorphoJ there is the option to Select Landmarks where you can include/exclude any landmarks in your total set. This will create a new dataset with only the landmarks you want. As for informative landmarks, that depends on the structure under study as well as sample size. I recommend picking up many of Dr. Klingenberg’s references, the Zelditch text (green book) and many, many more to asses the validity of landmark dimensionality to sample size and shape characterization. Best, Amanda Amanda R. Hale, M.A., C-FASE II > On Mar 25, 2019, at 8:41 AM, Sara Schoen wrote: > > Hello! > > I'm working on the beginnings of a masters thesis and part of it is taking > over a project from a previous student. I am learning MorphoJ to help finish > that project, but the original student used 14 landmarks (LMs) and we've > realized some of those are not helpful in our anaylsis. They act as noise and > I've been asked to exclude those points. > > Is there a way for me to exclude those LMs (as in only consider 1-9 and > ignore 10-14) in MorphoJ or would it be better to just start over? > > If I start over, is there a certain number of LMs I *need* to have? Is there > a minimum? How will this change the results if I don't have a lot? The "New" > method would include 9 LMs. > > Thank you to any help/advice you can give me! > > -- > 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 morphmet+unsubscr...@morphometrics.org. -- 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 morphmet+unsubscr...@morphometrics.org.
RE: [MORPHMET] Question about MorphoJ/Landmarking
t on having an accurat= e estimate of variation (e.g Procrustes anova), and those landmarks have a = high level uncertainty, you might be better of excluding them. If your goal= is estimating a mean shape and/or comparing mean shapes, then it may not m= atter as much... You also need to factor in your sample size and the dimens= ionality of your data. These are all well chewed topics in GMM (with variab= le conclusions), you may want to read some background. M -Original Message- From: Sara Schoen =20 Sent: Monday, March 25, 2019 5:41 AM To: MORPHMET Subject: [MORPHMET] Question about MorphoJ/Landmarking Hello! I'm working on the beginnings of a masters thesis and part of it is taking = over a project from a previous student. I am learning MorphoJ to help finis= h that project, but the original student used 14 landmarks (LMs) and we've = realized some of those are not helpful in our anaylsis. They act as noise a= nd I've been asked to exclude those points.=20 Is there a way for me to exclude those LMs (as in only consider 1-9 and ign= ore 10-14) in MorphoJ or would it be better to just start over?=20 If I start over, is there a certain number of LMs I *need* to have? Is ther= e a minimum? How will this change the results if I don't have a lot? The "N= ew" method would include 9 LMs.=20 Thank you to any help/advice you can give me! --=20 MORPHMET may be accessed via its webpage at http://www.morphometrics.org ---=20 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 e= mail to morphmet+unsubscr...@morphometrics.org. --=20 MORPHMET may be accessed via its webpage at http://www.morphometrics.org ---=20 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 e= mail to morphmet+unsubscr...@morphometrics.org.
[MORPHMET] Question about MorphoJ/Landmarking
Hello! I'm working on the beginnings of a masters thesis and part of it is taking over a project from a previous student. I am learning MorphoJ to help finish that project, but the original student used 14 landmarks (LMs) and we've realized some of those are not helpful in our anaylsis. They act as noise and I've been asked to exclude those points. Is there a way for me to exclude those LMs (as in only consider 1-9 and ignore 10-14) in MorphoJ or would it be better to just start over? If I start over, is there a certain number of LMs I *need* to have? Is there a minimum? How will this change the results if I don't have a lot? The "New" method would include 9 LMs. Thank you to any help/advice you can give me! -- 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 morphmet+unsubscr...@morphometrics.org.
