Relative sample sizes
50:50
(1:1)
60:40
(1.5:1)
67:33
(2:1)
75.25
(3:1)
80.30
(4:1)
83.17
(5:1)
91.9
(10:1)
[P
X=1
× (1 − P
X=1
)]
−1
4.0
4.2
4.5
5.4
6.3
7.2
13
Table 3:
Sample size multiplier, 1/Var[X
1
, ..., X
n
]=[P
X=1
× (1 − P
X=1
)]
−1
, when X is binary, as a function of relative sizes of samples in which X = 1 and X = 0. Multipliers rounded up, and to two significant digits.
