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. Author manuscript; available in PMC: 2020 Sep 12.
Published in final edited form as: Biometrics. 2019 Nov 14;76(3):951–962. doi: 10.1111/biom.13164

Figure 3.

Figure 3.

Estimated power at a fixed harmonic mean of 30 for SW-CRTs with 6 clusters. i) harmonic mean: uses the variance formula in equation 8 of Hussey and Hughes (2007) plugging-in a harmonic mean of 30, ii) arithmetic mean: uses the variance formula in equation 8 of Hussey and Hughes (2007) plugging-in the arithmetic mean given on the X-axis, iii) varying cluster sizes known: uses the variance formula in equation 2, iv) varying cluster size (CV): uses the variance formula in equation 3, v) randomization order: uses the variance formula in equation 1, vi) empirical: the mean empirically simulated power from 150 simulations of each randomization order (108,000 simulations in total).