Measurement Invariance of Moral Foundations across Population Strata

A representative sample (n = 2282) of Swedish adults completed the Moral Foundations Questionnaire, which measures moral intuitions concerning care, fairness, loyalty, authority, and purity. A subset (n = 607) completed a measure of intuitions about liberty. Measurement invariance was estimated across sex, age, education, income, left-right placement, religiosity, and party preference groups, based on multigroup confirmatory factor analyses of two-, three-, five-, six-, and eight-factor models, as well as bifactor models (with methods factors or a general factor). Acceptable configural, metric, and scalar invariance was obtained for most group comparisons, particularly based on the more complex models. The clearest exceptions were (1) configural non-invariance in comparisons involving participants with very low education or income, and (2) scalar non-invariance in comparisons of ideological groups based on three- and six-factor models but not the eight-factor model, which distinguished lifestyle liberty from government liberty.