riskRatioExactCI

Obtains the exact unconditional confidence interval for
risk ratio based on the standardized score statistic.

Performs power and sample size calculation for non-proportional hazards model using the Fleming-Harrington family of weighted log-rank tests. The sequentially calculated log-rank test score statistics are assumed to have independent increments as characterized in Anastasios A. Tsiatis (1982) <doi:10.1080/01621459.1982.10477898>. The mean and variance of log-rank test score statistics are calculated based on Kaifeng Lu (2021) <doi:10.1002/pst.2069>. The boundary crossing probabilities are calculated using the recursive integration algorithm described in Christopher Jennison and Bruce W. Turnbull (2000, ISBN:0849303168). The package can also be used for continuous, binary, and count data. For continuous data, it can handle missing data through mixed-model for repeated measures (MMRM). In crossover designs, it can estimate direct treatment effects while accounting for carryover effects. For binary data, it can design Simon's 2-stage, modified toxicity probability-2 (mTPI-2), and Bayesian optimal interval (BOIN) trials. For count data, it can design group sequential trials for negative binomial endpoints with censoring. Additionally, it facilitates group sequential equivalence trials for all supported data types. Moreover, it can design adaptive group sequential trials for changes in sample size, error spending function, number and spacing or future looks. Finally, it offers various options for adjusted p-values, including graphical and gatekeeping procedures.

Kaifeng Lu

lrstat

Power and Sample Size Calculation for Non-Proportional Hazards
and Beyond

riskRatioExactCI function

<dl><dt>n1</dt>
<dd>The sample size for the active treatment group.</dd>
<dt>y1</dt>
<dd>The number of responses for the active treatment group.</dd>
<dt>n2</dt>
<dd>The sample size for the control group.</dd>
<dt>y2</dt>
<dd>The number of responses for the control group.</dd>
<dt>cilevel</dt>
<dd>The confidence interval level.</dd></dl>

Arguments

Kaifeng Lu, <a href="/link/kaifenglu%40gmail.com?package=lrstat&version=0.2.13" data-mini-rdoc="lrstat::kaifenglu@gmail.com">kaifenglu@gmail.com</a>

Author

Exact Unconditional Confidence Interval for Risk Ratio — riskRatioExactCI

<dl>

<dt>n1</dt>
<dd>The sample size for the active treatment group.</dd>


<dt>y1</dt>
<dd>The number of responses for the active treatment group.</dd>


<dt>n2</dt>
<dd>The sample size for the control group.</dd>


<dt>y2</dt>
<dd>The number of responses for the control group.</dd>


<dt>cilevel</dt>
<dd>The confidence interval level.</dd>

</dl>

Kaifeng Lu, <a href='mailto:kaifenglu@gmail.com'>kaifenglu@gmail.com</a>

riskRatioExactCI: Exact Unconditional Confidence Interval for Risk Ratio

Description

Usage

Value

Arguments

Author

Examples