est.power

Calculates the estimated power to detect a valid surrogate given a total sample size and specified alternative

Uses a novel rank-based nonparametric approach to evaluate a surrogate marker
in a small sample size setting. Details are described in Parast et al (2024)
<doi:10.1093/biomtc/ujad035> and Hughes A et al (2025)
<doi:10.1002/sim.70241>. A tutorial for this package can be found at
<https://www.laylaparast.com/surrogaterank> and a Shiny App
implementing the package can be found at
<https://parastlab.shinyapps.io/SurrogateRankApp/>.

Layla Parast

SurrogateRank

Rank-Based Test to Evaluate a Surrogate Marker

Arthur Hughes

est.power function

<dl> <dt>n.total</dt>
<dd>total sample size in study</dd> <dt>rho</dt>
<dd>rank correlation between Y and S in group 0, default is 0.8</dd> <dt>u.y.alt</dt>
<dd>specified alternative for u.y</dd> <dt>delta.alt</dt>
<dd>specified alternative for u.s</dd> <dt>power.want.s</dt>
<dd>desired power for u.s, default is 0.7</dd></dl>

Arguments

Author

Estimated power to detect a valid surrogate — est.power

<dl>

 <dt>n.total</dt>
<dd>total sample size in study</dd>

 <dt>rho</dt>
<dd>rank correlation between Y and S in group 0, default is 0.8</dd>

 <dt>u.y.alt</dt>
<dd>specified alternative for u.y</dd>

 <dt>delta.alt</dt>
<dd>specified alternative for u.s</dd>

 <dt>power.want.s</dt>
<dd>desired power for u.s, default is 0.7</dd>

</dl>

est.power: Estimated power to detect a valid surrogate

Description

Usage

Value

Arguments

Author

Examples