power_nb: Calculate sample size or power for comparing 2 negative...

In th-zelniker/TIMI:

Calculate sample size or power for comparing 2 negative binomial rates (either n or power needs to included)

Description

Calculate sample size or power for comparing 2 negative binomial rates (either n or power needs to included)

Usage

power_nb(
  n = NULL,
  r0,
  r1,
  RR,
  k,
  duration = 1,
  ssize.ratio = 1,
  alpha = 0.025,
  power = NULL,
  approach = 3
)

Arguments

n	Sample Size; Leave NULL to calculate power
r0	Event Rate (Placebo)
r1	Event Rate (Treatment); Alernatively, enter RR
RR	Rate Ratio
k	Negative binomial dispersion parameter (see dispersion_nb Function)
duration	Average treatment duration
ssize.ratio	Sample allocation ratio n1/n0 (Default is 1)
alpha	1-sided alpha (Type I error)
approach	1 (Use reference group rate), 2 (Use true rates), or 3 (Use ML estimation); see Zhu and Lakkis (2014).
beta	Type II error; Leave NULL to calculate sample size

Value

Either power of Number of events reported

th-zelniker/TIMI documentation built on Oct. 1, 2022, 2 p.m.