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Complex Samples Sampling Wizard
Figure 13-2
Sampling Wizard, Design Variables step (stage 1)
E Select County as a stratication variable.
E Select Township as a cluster variable.
E Click Next, and then click Next in the Sampling Method step.
This design structure means that independent samples are drawn for each county. In this stage,
townships are drawn as the primary sampling unit using the default method, simple random
sampling.