Hi:
Here's an example:
x <- rnorm(300)
hist(x, breaks = 15, yaxt = 'n', ylab = 'Relative frequency')
axis(2, at = seq(0, 50, by = 10), labels = round(seq(0, 50, by =
10)/length(x), 3))
HTH,
Dennis
On Thu, Mar 3, 2011 at 8:29 AM, jpmaroco <jpmar...@gmail.com> 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.
>
> 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
> >
> > --
> > View this message in context:
> http://r.789695.n4.nabble.com/Probabilities-greather-than-1-in-HIST-tp3333388p3333388.html<
> http://r.789695.n4.nabble.com/Probabilities-greather-than-1-in-HIST-tp3333388p3333388.html?by-user=t
> >
> > Sent from the R help mailing list archive at Nabble.com.
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > [hidden email] mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
>
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
>
> ______________________________________________
> [hidden email] mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
>
> _____
>
> If you reply to this email, your message will be added to the discussion
> below:
>
>
> http://r.789695.n4.nabble.com/Probabilities-greather-than-1-in-HIST-tp3333388p3333619.html
>
> To unsubscribe from Probabilities greather than 1 in HIST, click here <
> http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=3333388&code=anBtYXJvY29AZ21haWwuY29tfDMzMzMzODh8LTE1ODEwNTQwMA==>
> .
>
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/Probabilities-greather-than-1-in-HIST-tp3333388p3333670.html
> Sent from the R help mailing list archive at Nabble.com.
> [[alternative HTML version deleted]]
>
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
