Title: Structural Equation Modeling for Social Relations Models: The R package srm Authors: Alexander Robitzsch, Steffen Nestler, Oliver Lüdtke Affiliation: Leibniz Institute for Science and Mathematics Education; Centre for International Student Assessment; University of Münster Abstract: The social relations model (SRM) is widely used in psychology to investigate the components that underlie interpersonal perceptions, behaviors, and judgments. SRM researchers are often interested in investigating the multivariate relations between SRM effects. However, at present, it is not possible to investigate such relations without relying on a two-step approach that depends on potentially unreliable estimates of the true SRM effects. Here, we introduce a way to combine the SRM with the structural equation modeling (SEM) framework and show how the parameters can be estimated with a maximum likelihood approach. The estimation approach is implemented in the R package srm. Some estimation details and the modeling setup of the R package are presented.