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Raudenbush, Stephen W. 2001. "Comparing Personal Trajectories and Drawing Causal Inferences from Longitudinal Data." Annual Review of Psychology, 52: 501-525.
This review considers statistical analysis of data from studies that obtain repeated measures on each of many participants. Such studies aim to describe the average change in populations and to illuminate individual differences in trajectories of change. A person-specific model for the trajectory of each participant is viewed as the foundation of any analysis having these aims.