ss_best_binomial {ssutil} | R Documentation |
Sample Size to Select the Best Group in a Binomial Test
Description
Computes the minimum sample size per group required to achieve a target probability
of correctly selecting the best group in a binomial test. The best group is assumed
to have success probability p1
, and the other groups have p1 - dif
.
Usage
ss_best_binomial(power, p1, dif, ngroups, max_n = 1000)
Arguments
power |
Numeric. Desired probability of correctly selecting the best group (in [0, 1]). |
p1 |
Numeric. Probability of success in the best group (in [0, 1]). |
dif |
Numeric. Difference in success probability with the next best group (> 0). |
ngroups |
Integer. Number of groups (must be > 1). |
max_n |
Integer. Maximum sample size to evaluate (default is 1000). |
Details
The function searches for the smallest npergroup
such that the power from
power_best_binomial
is at least the target power
.
Value
An integer representing the minimum sample size per group required to reach the specified power.
Examples
ss_best_binomial(power = 0.9, p1 = 0.8, dif = 0.2, ngroups = 4)