R : Copyright 1998, The R Development Core Team
Version 0.63.1 In progress (December 1, 1998)

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> ####	d|ensity
> ####	p|robability (cumulative)
> ####	q|uantile
> ####	r|andom number generation
> ####
> ####	Functions for  ``d/p/q/r''
> 
> source(paste(getenv("SRCDIR"),"all.equal.R", sep="/"))
> 
> if(!interactive()) .Random.seed <- c(0,rep(7654, 3))
> 
> ##--- Cumulative Poisson '==' Cumulative Chi^2 :
> ##--- Abramowitz & Stegun, p.941 :  26.4.21 (26.4.2)
> n1 <- 20; n2 <- 16
> for(lambda in rexp(n1))
+     for(k in rpois(n2, lambda)) {
+ 	tst <- all.equal(1 - pchisq(2*lambda, 2*(k+1)),
+ 			 sum(dpois(0:k, lambda=lambda)))
+ 	if(!(is.logical(tst) && tst))
+ 	    cat("lambda=", format(lambda),".  k =",k, " --> tst=", tst,"\n")
+     }
> 
> ##--- Cumulative Binomial '==' Cumulative F :
> ##--- Abramowitz & Stegun, p.945-6;  26.5.24  AND  26.5.28 :
> n0 <- 50; n1 <- 16; n2 <- 20; n3 <- 8
> for(n in rbinom(n1, size = 2*n0, p = .4)) {
+     cat("n=",n,": ")
+     for(p in c(0,1,rbeta(n2, 2,4))) {
+ 	cat(".")
+ 	for(k in rbinom(n3, size = n,  prob = runif(1))) {
+ 	    ## For X ~ Bin(n,p), compute 1 - P[X > k] = P[X <= k]  in two ways:
+ 	    tst <- all.equal(if(k==n || p==0) 1 else
+ 			     pf((k+1)/(n-k)*(1-p)/p, df1=2*(n-k), df2=2*(k+1)),
+ 			     sum(dbinom(0:k, size = n, prob = p)))
+ 	    if(!(is.logical(tst) && tst))
+ 		cat("n=", n,"; p =",format(p),".  k =",k, " --> tst=",tst,"\n")
+ 	}
+     }
+     cat("\n")
+ }
n= 46 : ......................
n= 42 : ......................
n= 36 : ......................
n= 37 : ......................
n= 34 : ......................
n= 43 : ......................
n= 41 : ......................
n= 39 : ......................
n= 34 : ......................
n= 43 : ......................
n= 37 : ......................
n= 39 : ......................
n= 41 : ......................
n= 48 : ......................
n= 43 : ......................
n= 33 : ......................
>