This is an ideal text for advanced courses in research methods and experimental design. It argues that the methodology of quantitative research is a unified discipline with basic notions, procedures and ways of reasoning which can be applied across the social, behavioural and life sciences. Key designs, models and methods in research are covered by leading contributors in their field who seek to explain the fundamentals of the research process to enable the student to understand the broader implications and unifying themes.

Longitudinal Analysis

Peter C. M.Molenaar

Longitudinal analysis involves the analysis of change.

This preliminary definition of longitudinal analysis will be specified in several respects later on, but for the moment let it be understood in its common-sense meaning and let us consider the question why a study of change might be worthwhile to pursue. This question can be answered in several ways.

First, an analysis of change constitutes the royal road to understand the causal mechanisms underlying observed phenomena. For instance, all ...

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