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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
(b) Required number of centers N for varying number of within center subjects n and baseline rate β0, while β1 = 0.18 and σ2 = 0.5 were fixed.
graphic file with name nihms-472886-t0004.jpg −1.6 (0.20) −1.2 (0.30) −0.8 (0.45) −0.4 (0.67) 0 (1.0) 0.4 (1.49) 0.8 (2.23) 1.2 (3.32) 1.6 (4.95)
20 Np
NOA 		179 (0.82)
258		 120 (0.82)
181		 81 (0.82)
130		 54 (0.84)
95		 36 (0.83)
72		 25 (0.80)
56		 17 (0.82)
46		 11 (0.80)
39		 8 (0.83)
34
50 Np
NOA 		72 (0.82)
104		 48 (0.81)
73		 33 (0.82)
52		 22 (0.83)
38		 15 (0.81)
29		 10 (0.81)
23		 7 (0.79)
19		 5 (0.85)
16		 3 (0.76)
14
200 Np
NOA 		18 (0.82)
26		 12 (0.82)
19		 9 (0.85)
13		 6 (0.82)
10		 4 (0.81)
8		 3 (0.84)
6