# Power in a Group Sequential Design

## Documentation for package ‘PwrGSD’ version 2.3.8

- DESCRIPTION file
- User guides, package vignettes and other documentation

## Help Pages

agghaz | Aggregated Hazard
as.boundaries | Convert a "PwrGSD" object to a "boundaries" object
CDFOR2LRR | Convert CDF Odds Ratio to Logged Relative Risks
CondPower | Conditional type I and type II error probabilities given current value of the test statistic
cpd.PwrGSD | Create a skeleton compound PwrGSD object
CRRtoRR | Cumulative-risk ratios to risk ratios
CY2TOShaz | Calender year rates to Study Year Rates
detail | Function to extract the 'detail' component from a 'PwrGSD' object
DX | A utility function for forming differences
Elements | Create a subset of a "cpd.PwrGSD" object
EX1gXK | A function for computing the bias adjusted point estimate for a statistic observed to cross the efficacy boundary.
GrpSeqBnds | Computes efficacy and futility boundaries
gsd.dens | A function for computing the probability density for the group sequentially monitored test statistic.
Haybittle | The Haybittle method of Boundary Construction
IntSurvDiff | Weighted Integrated Survival function test
LanDemets | The Lan-Demets method of Boundary Construction
lookup | Lookup values for a piecewise constant function
lung | Mayo Clinic Lung Cancer Data
mystack | Stack a dataset
mysurvfit | My Survfit
ObrienFleming | The O'Brien-Fleming Alpha Spending Function
plot.cpd.PwrGSD | Plot Method for cpd.PwrGSD objects
Pocock | The Pocock Alpha Spending Function
Pow | The Wang-Tsiatis Power Alpha Spending Function
Power | Extract the Power results
PwrGSD | Calculate Power in a Group Sequential Design
RCM2RR | Relative cumulative mortality to Relative Risk
RR2RCM | Relative risk to Relative Cumulative Mortality
SC | The Stochastic Curtailment method of Boundary Construction
SCtoBdry | Converts a stochastic curtailment boundary (conditional type I or II error probability) into a (efficacy or futility) boundary on the standardized Z scale
SimGSB | Verifies the results of "GrpSeqBnds" via simulation
wtdlogrank | Weighted log-rank test