Hi, I am use physiological data (cortisol and sAA) to determine patterns of response to a stressor in children by entering this data into a Latent Class Analysis. We did not transform our data to avoid obscuring naturally occurring groups. Reviewers of our paper are asking us for references to support using untransformed cortisol data in an LCA. Do you have any suggestions for general references to support using untransformed data in an LCA or specific to use with cortisol data? Thanks!