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. Author manuscript; available in PMC: 2013 May 28.
Published in final edited form as: Epidemiology. 2007 Jul;18(4):461–468. doi: 10.1097/EDE.0b013e31806462d3

Figure 2.

Figure 2

The power for the testing H0: β1 = 0. v.s. H1 : β1 = 0.1. (a). The power as a, cut-point for defining the strata in term of σY, varies with sample size (n0, n1, n2) = (200, 100, 100); (b). The power as ρ, the fraction of SRS sample, varies with n = 400, n1 = n2, and a = 1.