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Table 5 The number of matched-pairs ( N ) needed to reach power of 50%, 60%, 70%, 80%, and 90%, averaged over five values of θ and three values of p 1+ , for three values of Δ=p +1 −p 1+

From: The McNemar test for binary matched-pairs data: mid-p and asymptotic are better than exact conditional

  Nto reach power of
  50% 60% 70% 80% 90%
Δ=0.15
McNemar asymptotic 56 69 85 103∗ 123∗
McNemar asymptotic w/CC 68 82 98 114∗ 129∗
McNemar exact 67 81 96 113∗ 129∗
McNemar mid-p 57 71 87 104∗ 123∗
Exact unconditional 57 71 88 106∗ 126∗
Δ=0.25
McNemar asymptotic 23 28 34 42 54
McNemar asymptotic w/CC 30 35 41 50 63
McNemar exact 29 34 41 49 62
McNemar mid-p 24 29 35 43 56
Exact unconditional 24 29 35 43 56
Δ=0.35
McNemar asymptotic 13 15 18 23 29
McNemar asymptotic w/CC 18 21 24 28 34
McNemar exact 18 21 23 27 34
McNemar mid-p 15 17 20 24 30
Exact unconditional 15 17 20 24 29
  1. ∗Values above 100 estimated by linear extrapolation.
  2. This table should not be used for sample size calculations.
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BMC Medical Research Methodology

ISSN: 1471-2288

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