R help - Aug 2004 - relative frequencies for hist()

I have problems getting a histogram with relative frequencies on the y-axis.

Here is an example data set:

 > a <- c(4.626, 4.627, 4.627, 4.628, 4.629, 4.629, 4.630, 4.631, 4.632, 
             4.632)
 > d = hist(a,freq=F)
 > d$density
[1] 299.9999 100.0000 200.0000 100.0000 100.0000 200.0000

The obtained densities are given by counts/(total n * bin width), with 
bin width being 0.001 in this case.

Is there any way to get a histogram with relative frequencies 
irrespective of bin width, i.e. counts/total n ? It doesn't seem to work 
for truehist() either.

Thanks.
Steffen

Hi!

d$counts/length(a)


And of course you can if it is what you want.

d$density<-d$counts/length(a)
plot(d,freq=F)


Sincerely Eryk


*********** REPLY SEPARATOR  ***********

On 8/21/2004 at 7:10 PM Steffen Katzner wrote:
>I have problems getting a histogram with relative frequencies on the
>y-axis.
>
>Here is an example data set:
>
> > a <- c(4.626, 4.627, 4.627, 4.628, 4.629, 4.629, 4.630, 4.631,
4.632,
>             4.632)
> > d = hist(a,freq=F)
> > d$density
>[1] 299.9999 100.0000 200.0000 100.0000 100.0000 200.0000
>
>The obtained densities are given by counts/(total n * bin width), with 
>bin width being 0.001 in this case.
>
>Is there any way to get a histogram with relative frequencies 
>irrespective of bin width, i.e. counts/total n ? It doesn't seem to work
>for truehist() either.
>
>Thanks.
>Steffen
>
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Dipl. bio-chem. Eryk Witold Wolski    @    MPI-Moleculare Genetic   
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