PeerJ Author 35 Points Contributions by role Preprint Author 35 Contributions by subject area Genetics Psychiatry and Psychology Science and Medical Education Statistics Hermine H Maes PeerJ Author Summary Epidemiology Medical Genetics Statistics Past or current institution affiliations Virginia Commonwealth University PeerJ Contributions Preprints 1 October 19, 2017 - Version: 1 umx: Twin and Path-based Structural Equation Modeling in R Timothy C Bates, Hermine H Maes, Michael C Neale https://doi.org/10.7287/peerj.preprints.3354v1