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. Author manuscript; available in PMC: 2014 Oct 16.
Published in final edited form as: Stat Med. 2013 Apr 16;32(24):4162–4179. doi: 10.1002/sim.5819
(c) Required number of centers N for varying number of within center subjects n and between center variance σ2, while β0 = −1.6 and β1 = 0.18 were fixed.
graphic file with name nihms-472886-t0005.jpg 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5
20 Np
NOA 		223 (0.83)
251		 202 (0.79)
286		 183 (0.81)
324		 165 (0.80)
366		 150 (0.79)
410		 135 (0.80)
458		 123 (0.82)
511		 111(0.81)
567
50 Np
NOA 		90 (0.83)
100		 81 (0.81)
114		 73 (0.84)
130		 66 (0.81)
146		 60 (0.81)
164		 54 (0.80)
183		 49 (0.81)
204		 45 (0.77)
227
200 Np
NOA 		23 (0.83)
25		 21 (0.82)
29		 19 (0.83)
32		 17 (0.83)
37		 15 (0.81)
41		 14 (0.77)
46		 13 (0.79)
51		 12 (0.81)
57