Derives group sequential designs and describes their properties.
3.0-1, January, 2016
More changes to comply with R standards (in NAMESPACE - importFrom statements - and DESCRIPTION - adding plyr to imports) ensuring appropriate references.
Deleted link in documentation that no longer exists (gsBinomialExact.Rd).
3.0-0, December, 2015
Updated xtable extension to meet R standards for extensions.
Fixed xtable.gsSurv and print.gsSurv to work with 1-sided designs
Update to calls to ggplot to replace show_guide (deprecated) with show.legend arguments where used in geom_text (function from ggplot2 package) calls; no user impact
Minor typo fixed in sfLogistic help file
Cleaned up "imports" and "depends" in an effort to be an R "good citizen"
Registered S3 methods in NAMESPACE
Minor edit to package description to comply with R standards
2.9-3, November, 2014
Added sfTrimmed as likely preferred spending function approach to skipping early or all interim efficacy analyses; this also can adjust bound when final analysis is performed with less than maximum planned information. Updated help(sfTrimmed) to demonstrate these capabilities.
Added sfGapped, which is primarily intended to eliminate futility analyses later in a study; see help(sfGapped) for an example
Added summary.spendfn to provide textual summary of spending functions; this simplified the print function for gsDesign objects
Added sfStep which can be used to set an interim spend when the exact amount of information is unknown; an example of how this can be misused is provided in the help file.
Fixed rounding so that gsBoundSummary, xtable.gsSurv and summary.gsDesign are consistent for gsSurv objects