Hi everyone, I am starting a new project using GM working with groups with different sizes (eg. rodents and small carnivores). I would like to use the whole dataset combined in the analyses, instead of perform set of analyses for each sized group. So, I did a test using the same skull and place the camera in two distance to the object (~15 cm and ~30 cm). My expectation was after scaling (using tpsDig) I wouldn´t detect any meaningful difference in the dataset. However, I got two clear groups that were even statistically different. I have attached here the tps file that I used (10 copies of the same skull, 5 at ~15 cm and 5 at ~30cm). My question is how can I combine two set of 2d landmarks based on photos taken from different distance to the object. I would greatly appreciate any suggestion.
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