Intermediate f and chisq functions to simplify writing for both R and S-Plus.
dchisq.intermediate(x, df, ncp=0, log=FALSE)
pchisq.intermediate(q, df, ncp=0, lower.tail=TRUE, log.p=FALSE)
qchisq.intermediate(p, df, ncp=0, lower.tail=TRUE, log.p=FALSE)
df.intermediate(x, df1, df2, ncp=0, log=FALSE)
pf.intermediate(q, df1, df2, ncp=0, lower.tail=TRUE, log.p=FALSE)
qf.intermediate(p, df1, df2, ncp=0, lower.tail=TRUE, log.p=FALSE)