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.
Usage
Power(object, subset, nlook.ind = NULL)
Arguments
object
an object of class cpd.PwrGSD
subset
you may extract a subset via a logical expression in the
variables of the index dataframe, descr
nlook.ind
(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
Value
a dataframe, stacked by rows of `descr' and then by choices of `stat'