Program Matlab Yu, H.-T. (2013). Models with discrete latent variables for analysis of categorical data: A framework and a MATLAB MDLV toolbox. Behavioral Research Methods, 45, 1036-1047. SAS Yu, H.-T. (2015). Applying linear mixed-effects models with crossed random effects to psycholinguistic data: Multilevel specification and model selection. The Quantitative Methods for Psychology, 11, 78-88.