9 Power Analysis for Multilevel Studies
It is common to collect data from individuals who are part of some larger group or unit. For example, in educational research, you might collect data from 150 children grouped into five classrooms. In organizational research, you might collect data from 500 employees in eight separate organizations. This sort of hierarchical data structure creates many potential problems and ambiguities in data analysis, but it also presents opportunities for answering important questions about why scores vary (e.g., how important differences are between schools vs. differences between individuals).
Consider our education example. Suppose you find that there is substantial variability in educational ...
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