samplesizeRiskRatioExact {lrstat} | R Documentation |
Sample size for exact unconditional test of risk ratio
Description
Obtains the sample size given power for exact unconditional test of risk ratio.
Usage
samplesizeRiskRatioExact(
beta = NA_real_,
riskRatioH0 = 1,
pi1 = NA_real_,
pi2 = NA_real_,
allocationRatioPlanned = 1,
alpha = 0.025
)
Arguments
beta |
The type II error. |
riskRatioH0 |
The risk ratio under the null hypothesis. Defaults to 1. |
pi1 |
The assumed probability for the active treatment group. |
pi2 |
The assumed probability for the control group. |
allocationRatioPlanned |
Allocation ratio for the active treatment versus control. Defaults to 1 for equal randomization. |
alpha |
The one-sided significance level. |
Value
A data frame with the following variables:
-
alpha
: The specified one-sided significance level. -
attainedAlpha
: The attained one-sided significance level. -
power
: The power. -
n
: The sample size. -
riskRatioH0
: The risk ratio under the null hypothesis. -
pi1
: The assumed probability for the active treatment group. -
pi2
: The assumed probability for the control group. -
allocationRatioPlanned
: Allocation ratio for the active treatment versus control. -
zstatRiskRatioBound
: The critical value on the scale of score test statistic for risk ratio. -
pi2star
: The response probability in the control group at which the critical value of the test statistic is attained.
Author(s)
Kaifeng Lu, kaifenglu@gmail.com
Examples
samplesizeRiskRatioExact(beta = 0.2, riskRatioH0 = 0.833,
pi1 = 0.9, pi2 = 0.9, alpha = 0.05)