Gu, Fei; Preacher, Kristopher J.; Ferrer, Emilio - In: Journal of Educational and Behavioral Statistics 39 (2014) 2, pp. 117-143
Mediation is a causal process that evolves over time. Thus, a study of mediation requires data collected throughout the process. However, most applications of mediation analysis use cross-sectional rather than longitudinal data. Another implicit assumption commonly made in longitudinal designs...