Mixed-effects models are an analytic technique for modeling repeated measurement or nested data. This paper explains the logic of mixed-effects modeling and describes two examples of mixed-effects analyses using R. The intended audience of the paper is psychologists who specialize in cognitive development research. Therefore, the concepts and…

This article gives a reflective account of lessons learned from the experiences of three cognitive developmental scientists conducting psychological research in educational settings. First, we describe and analyze four key cultural distinctions between traditional approaches to research in psychology and education: 1) different structures, 2)…