cond.cdf(p.eval,ncp,test=c("t","z"),alternative=c("two.sided","less",
"greater"), df=if(test=="z")Inf else df,keep.cdf=NULL,
suppressWarnings=TRUE)t-test or z-test.t.test.NULL or an environment. If this is non-null, the computed CDF will also be stored in keep.cdf environment to allow later use. As of version 1.4-0, keep.cdf=TRUE, is no longer supportep.eval and each column corresponding to ncp.