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List of figures. List of tables. Preface. Introduction. Multilevel statistical models. Concepts of statistical power analysis. Cluster randomized trials. Improving statistical power in cluster randomized trials. Multisite trials. Pseudo cluster randomized trials. Individually randomized group treatment trials. Longitudinal intervention studies. Extensions: three levels of nesting and factorial designs. The problem of unknown intraclass correlation coefficients. Computer software for power calculations. References. Author Index. Subject Index. |