“…The limited information approach is adopted here. The general framework of structural equation modelling includes models for continuous variables, categorical variables, and mixtures of variables (Arminger & Küsters, 1988;Muthén, 1984), confirmatory factor analysis (Jöreskog, 1969), mixed effects analysis (Fan & Hancock, 2012), multi-group analysis (Jöreskog, 1971;Muthén, 1989), latent growth curve analysis (Bollen & Curran, 2006), and non-linear models (Jöreskog & Yang, 1996;Wall & Amemiya, 2000) as special cases. Estimation and testing remain important research topics when models involve non-normally distributed observed variables such as ordinal variables.…”