On Mar 3, 2011, at 10:29 AM, jpmaroco wrote:
Dear David,
Thanks for your prompt reply.
I see your point. But how can I get a histogram with relative
frequencies? If I use
plot(xhist,yhist)
I get absolute frequencies in the Y axis.
In my earlier reply I meant to type yaxt="n".
--
David.
Best,
Joao
From: David Winsemius [via R] [mailto:ml-node+3333619-1272092771-215...@n4.nabble.com
]
Sent: quinta-feira, 3 de Março de 2011 16:01
To: jpmaroco
Subject: Re: Probabilities greather than 1 in HIST
On Mar 3, 2011, at 8:03 AM, jpmaroco wrote:
Dear all,
I am a newbie in R and could not find help on this problem. I am
trying to
plot an histogram with probabilities in the y axis. This is the code
I am
using:
#TLC uniform
n=30
mi=1; mx=6
nrep=1000
xbar=rep(0,nrep)
for (i in 1:nrep) {xbar[i]=mean(runif(n,min=mi,max=mx))}
hist(xbar,prob=TRUE,breaks="Sturges",xlim=c(1,6),main=paste("n =",n),
xlab="Média", ylab="Probabilidade")
curve(dnorm(x,mean=mean(xbar),sd=sd(xbar)),add=TRUE,lwd=2,col="red")
The problem is that I am getting greater than 1 probabilities in the
Y axis?
Is there a way to correct this?
Despite the argument name, which I agree suggests that probabilities
will be plotted, what is really described in the help page is that
densities will be plotted, and densities may be greater than 1. You
can suppress plotting of the y-axis, calculate the probabilities for
each of the groups returned by hist, and then use the axes function.
xhist <- hist(xbar,breaks="Sturges",plot=FALSE)
yhist <- xhist$counts/sum(xhist$counts)
yhist
[1] 0.002 0.027 0.087 0.236 0.287 0.228 0.107 0.021 0.004 0.001
Many thanks in advance.
Joao
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