Power

The function `Power' is used to summarize the `cpd.PwrGSD' object into a
 dataframe containing power and type II error, summed over analysis
 times. The data frame is stacked by rows of `descr' and by `stat'
 (if there are multiple statistics being profiled per each component of
 `Elements'), for generating tables or performing other computations.

data

Tools for the evaluation of interim analysis plans for sequentially
monitored trials on a survival endpoint; tools to construct efficacy and
futility boundaries, for deriving power of a sequential design at a specified
alternative, template for evaluating the performance of candidate plans at a
set of time varying alternatives. See Izmirlian, G. (2014) <doi:10.4310/SII.2014.v7.n1.a4>.

Grant Izmirlian

PwrGSD

Power in a Group Sequential Design

Power function

<dl> <dt>object</dt>
<dd>an object of class <code>cpd.PwrGSD</code></dd> <dt>subset</dt>
<dd>you may extract a subset via a logical expression in the
 variables of the index dataframe, <code>descr</code></dd> <dt>nlook.ind</dt>
<dd>(optional) a vector containing a subset of the
 indices of analysis times over which the sum is formed. Use this
 for example if you want to know the probability of stopping by the
 kth analysis under an unfavorable alternative. Set nlook.ind to
 1:k</dd></dl>

Arguments

Grant Izmirlian &lt;izmirlian@nih.gov&gt;

Author

Extract the Power results — Power

<dl>

 <dt>object</dt>
<dd>an object of class <code>cpd.PwrGSD</code></dd>

 <dt>subset</dt>
<dd>you may extract a subset via a logical expression in the
 variables of the index dataframe, <code>descr</code></dd>

 <dt>nlook.ind</dt>
<dd>(optional) a vector containing a subset of the
 indices of analysis times over which the sum is formed. Use this
 for example if you want to know the probability of stopping by the
 kth analysis under an unfavorable alternative. Set nlook.ind to
 1:k</dd>

</dl>

Power: Extract the Power results

Description

Usage

Value

Arguments

Author

See Also

Examples