Factorial versus Typological Models: A Comparison of Methods for Personality Data

This article describes an exploration of the distinction between typological and factorial latent variables in the domain of personality theory. Traditionally, many personality variables have been considered to be factorial in nature, even though there are examples of typological constructs dating back to Hippocrates. Recently, some reconceptualizations of typological constructs have emerged due, in part, to the availability of more rigorous methodological tools for identification of types (or nominal latent traits). These tools include multidimensional item response theory (MIRT) and latent class analysis (LCA). Two studies, involving application of these methods, are discussed in this article. The first study uses data collected using a questionnaire based on the five-factor model (FFM) of personality. The second study is based on data collected to investigate the relationships between technology use and literacy skills. The findings of both studies indicate that, while a clear preference for a factoria...