The examples are in PDF format. Therefore, hypothesis tests and confidence intervals also account for all stages of nesting. The critical assumption is that the primary, or first-stage, clusters are independent of each other. WR option on the PROC statement. For example, consider a dental experiment where measurements are taken on each tooth surface from all teeth from a set of patients.
Patients are the primary clusters which are independent of each other.
Nested within each patient are teeth and surfaces within teeth. The schools were stratified by region of the country. Please see Order to obtain details. You may download additional information in PDF format.