[R] Why using hist when setting the parameter probability=TRUE does not create probability plot?
Duncan Murdoch
murdoch.duncan at gmail.com
Tue Jan 22 00:28:32 CET 2013
On 13-01-21 5:18 PM, hp wan wrote:
> Hi All,
>
> When carrying out hist(samples,breaks=50,probability=TRUE), the column
> values are considerably greater than 1, which seams very unreasonable. The
> plot is attached.
>
> I think the column value of the hist plot should correspond to
> x$counts/sum(x$counts)
> (x=hist(samples,breaks=50,probability=TRUE)). The size of data is a
> little bit larger, causing failure of uploading. If you need the data, I
> can email it to you.
>
> Can anyone help me?
I think you need to reread the documentation. It is a "probability
density" plot, not a "probability plot." You need to integrate the
values to get probabilities. Probability density functions can be
bigger than 1 as long as they integrate to 1.
Duncan Murdoch
>
> Thanks!
>
> Best regares,
>
> Huaping Wan
>
>
>
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