R version 2.8.1 (2008-12-22)
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ISBN 3-900051-07-0

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> par4 = '0.6'
> par3 = '25'
> par2 = '45'
> par1 = '1825'
> #'GNU S' R Code compiled by R2WASP v. 1.0.44 ()
> #Author: Prof. Dr. P. Wessa
> #To cite this work: Wessa P., (2008), Excercise 1.13 of Introduction to Probability (v1.0.2) in Free Statistics Software (v$_version), Office for Research Development and Education, URL http://www.wessa.net/rwasp_babies.wasp/
> #Source of accompanying publication: Office for Research, Development, and Education
> #Technical description: 
> par1 <- as.numeric(par1)
> par2 <- as.numeric(par2)
> par3 <- as.numeric(par3)
> par4 <- as.numeric(par4)
> numsuccessbig <- 0
> numsuccesssmall <- 0
> bighospital <- array(NA,dim=c(par1,par2))
> smallhospital <- array(NA,dim=c(par1,par3))
> bigprob <- array(NA,dim=par1)
> smallprob <- array(NA,dim=par1)
> for (i in 1:par1) {
+ bighospital[i,] <- sample(c('F','M'),par2,replace=TRUE)
+ if (as.matrix(table(bighospital[i,]))[2] > par4*par2) numsuccessbig = numsuccessbig + 1
+ bigprob[i] <- numsuccessbig/i
+ smallhospital[i,] <- sample(c('F','M'),par3,replace=TRUE)
+ if (as.matrix(table(smallhospital[i,]))[2] > par4*par3) numsuccesssmall = numsuccesssmall + 1
+ smallprob[i] <- numsuccesssmall/i
+ }
> tbig <- as.matrix(table(bighospital))
> tsmall <- as.matrix(table(smallhospital))
> tbig
   [,1]
F 40995
M 41130
> tsmall
   [,1]
F 22845
M 22780
> numsuccessbig/par1
[1] 0.06410959
> bigprob[par1]
[1] 0.06410959
> numsuccesssmall/par1
[1] 0.1150685
> smallprob[par1]
[1] 0.1150685
> numsuccessbig/par1*365
[1] 23.4
> bigprob[par1]*365
[1] 23.4
> numsuccesssmall/par1*365
[1] 42
> smallprob[par1]*365
[1] 42
> postscript(file="/var/www/rcomp/tmp/14amp1254910696.ps",horizontal=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> plot(bigprob,col=2,main='Probability in Large Hospital',xlab='#simulated days',ylab='probability')
> dev.off()
null device 
          1 
> postscript(file="/var/www/rcomp/tmp/2grt81254910696.ps",horizontal=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> plot(smallprob,col=2,main='Probability in Small Hospital',xlab='#simulated days',ylab='probability')
> dev.off()
null device 
          1 
> 
> #Note: the /var/www/rcomp/createtable file can be downloaded at http://www.wessa.net/cretab
> load(file="/var/www/rcomp/createtable")
> 
> a<-table.start()
> a<-table.row.start(a)
> a<-table.element(a,'Exercise 1.13 p. 14 (Introduction to Probability, 2nd ed.)',2,TRUE)
> a<-table.row.end(a)
> a<-table.row.start(a)
> a<-table.element(a,'Number of simulated days',header=TRUE)
> a<-table.element(a,par1)
> a<-table.row.end(a)
> a<-table.row.start(a)
> a<-table.element(a,'Expected number of births in Large Hospital',header=TRUE)
> a<-table.element(a,par2)
> a<-table.row.end(a)
> a<-table.row.start(a)
> a<-table.element(a,'Expected number of births in Small Hospital',header=TRUE)
> a<-table.element(a,par3)
> a<-table.row.end(a)
> a<-table.row.start(a)
> a<-table.element(a,'Percentage of Male births per day<br />(for which the probability is computed)',header=TRUE)
> a<-table.element(a,par4)
> a<-table.row.end(a)
> a<-table.row.start(a)
> a<-table.element(a,'#Females births in Large Hospital',header=TRUE)
> a<-table.element(a,tbig[1])
> a<-table.row.end(a)
> a<-table.row.start(a)
> a<-table.element(a,'#Males births in Large Hospital',header=TRUE)
> a<-table.element(a,tbig[2])
> a<-table.row.end(a)
> a<-table.row.start(a)
> a<-table.element(a,'#Female births in Small Hospital',header=TRUE)
> a<-table.element(a,tsmall[1])
> a<-table.row.end(a)
> a<-table.row.start(a)
> a<-table.element(a,'#Male births in Small Hospital',header=TRUE)
> a<-table.element(a,tsmall[2])
> a<-table.row.end(a)
> a<-table.row.start(a)
> dum1 <- paste('Probability of more than', par4*100, sep=' ')
> dum <- paste(dum1, '% of male births in Large Hospital', sep=' ')
> a<-table.element(a, dum, header=TRUE)
> a<-table.element(a, bigprob[par1])
> a<-table.row.end(a)
> dum <- paste(dum1, '% of male births in Small Hospital', sep=' ')
> a<-table.element(a, dum, header=TRUE)
> a<-table.element(a, smallprob[par1])
> a<-table.row.end(a)
> a<-table.row.start(a)
> dum1 <- paste('#Days per Year when more than', par4*100, sep=' ')
> dum <- paste(dum1, '% of male births occur in Large Hospital', sep=' ')
> a<-table.element(a, dum, header=TRUE)
> a<-table.element(a, bigprob[par1]*365)
> a<-table.row.end(a)
> dum <- paste(dum1, '% of male births occur in Small Hospital', sep=' ')
> a<-table.element(a, dum, header=TRUE)
> a<-table.element(a, smallprob[par1]*365)
> a<-table.row.end(a)
> a<-table.end(a)
> table.save(a,file="/var/www/rcomp/tmp/3dm0d1254910696.tab") 
> 
> system("convert tmp/14amp1254910696.ps tmp/14amp1254910696.png")
> system("convert tmp/2grt81254910696.ps tmp/2grt81254910696.png")
> 
> 
> proc.time()
   user  system elapsed 
  2.540   0.930   3.062