Data resource and R-tutorials for morphometric methods for species recognition

This repository contains R-scripts and a data file for the reproduction of figure 69.2 in Baur (2025; citation below in the References section). This figure shows a comparison of standard ordination methods (PCA and LDA) with Multivariate Ratio Analysis (MRA). The repository contains 5 files: 1_R-tutorial_for_reproducing_plate_69.2_in_Baur_2025.R: An R-tutorial for reproduction of each graph in the figure. 2_Data_Pteromalus_Klimmek_Baur_2018_Supplement_oo_153269.csv: A data file with distance measurements of Pteromalus species (data from Klimmek & Baur 2018, see References).3_Function_Shape_PCA_v1.02.R: A function file containing the MRA functions for the shape PCA and PCA ratio spectrum.4_Function_LDA_Ratio_Extractor_v1.03.R: A function file containing the MRA function for the LDA ratio extractor.Baur (2025) ...: The mentioned chapter 69 in manuscript form. Added here with permission of the publisher; however, do also check out the published version contained in the book Chalcidoidea of the World, edited by John Heraty and Jim Woolley (see below under References for full citation). For best results, put all R-scripts (tutorial and function files) together with the CSV data file in the same directory. Then start RStudio (or any other IDE) by clicking on the tutorial. This ensures that source and data files will be will recognized, otherwise paths must be specified. Use of MRA scripts: When using the MRA scripts for the Shape PCA, the PCA Ratio Spectrum, and the LDA Ratio Extractor in a publication, make sure that you download the newest versions from here 10.5281/zenodo.3890195. This is also the reference that should be cited, always together with the original paper by Baur & Leuenberger (2011). This ensures correct application and documentation of the methods. Further tutorials: Further topics mentioned by Baur (2025), for instance on allometry and measurement error, are dealt with in the following Zenodo repository from a workshop at the University of Berne:Baur, H. (2024, May 31). R-tutorials, datasets, and presentations from the workshop Morphometrics in Taxonomy (University of Bern). Zenodo. 10.5281/zenodo.11400348. Citation of this package: Use the citation provided by Zenodo (on this webpage), when using any materials listed in this repository, except as mentioned above under 'Use of MRA scripts'. Contact: Hannes Baur