The landmark points of the data specimens will be shown in blue, the current reference specimen will be shown in red. Some people like axis, some don’t! Copy Image to Clipboard (Not available on Mac) This button copies the graph onto the windows clipboard, so that it can be pasted from there into other programs. Furthermore, this method produces higher cross validation rates than either a fixed, maximal number of PC axes, or the partial least squares method. This tool is accessed through the Call Other Tools menu. Ontogenetic differences in ovenbird feathers thus present a system with a known variation in shape, but with some challenges to successful discrimination of shape.Automatic curve tracing did not work well with the specimens in this study. Regress6F has a permutation test based on a form of a Generalized Goodalls F-test for the significance of the regression model.
The different methods produced very similar rates of successful discrimination, based on the bootstrap estimates of the 95% confidence interval of the cross-validation rate of correct assignments. The points obtained this way were then analyzed using semi-landmark methods, Fourier methods, and extended eigenshape methods.Figure 1 Digitization using a fan template (A) and manual curve tracing (B) of the same feather. When working with shape data, landmark locations are relative to all other landmarks, not absolute or independent quantities. Edited by: Elewa AMT. 2004, Berlin , Springer, 245-258.Google ScholarNavarro N, Zatarain X, Montuire S: Effects of morphometric descriptor changes on statistical classification and morphospaces. Most (but not all) of the IMP programs will recognize and load the data labels. Semi-landmark methods were as effective in capturing the outlines of the feathers as the more established Fourier and eigenshape approaches.
The MorphoJ file format may also be helpful when exporting data into other software packages, as it includes a header line and specimen labels. Prior to scanning, the barbs and barbules of each feather were arranged in the typical interlocking manner, producing intact vanes. A blue background provided contrast and a ruler provided scaling information in each scanned image. The CVA was carried out on the training set and the resulting CV axis was used to classify the test data. This indicates that Procrustes Form Space is probably preferrable when larger variation in size is common, while Procrustes SP may be suitable for systems with little shape variation. Coordgen will load X1Y1…CS files in, so that you can convert from one superposition to another, or generate reference forms or plots from it.