[R] family question

Troels Ring tring at mail1.stofanet.dk
Wed Aug 30 18:48:01 CEST 2000

Dear friends. Please see the program below and answer if it does simulate a 
population of 1.000.000 families, each with at max 20000 children (typical 
in Denmark, you know), constructed such that each family stops having 
children when more boys than girls are present ? Equal numbers of boys and 
girls are got in the population, according to the simulation, is that obvious ?

ND <- NP <- NULL #ND - number boys, P: girls
for (j in 1:1000000) # number of families
n1 <- n2 <- NULL
for (i in 1:20000)  {
n1[i] <- rbinom(1,1,0.5) # each equally likely - here number of boys
n2[i] <- 1- n1[i] # and girls
if(sum(n1)>sum(n2)) break
ND[j] <- sum(n1)
NP[j] <- sum(n2)

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