Amelie LESCROEL wrote:> Hello,
>
>
>
> Could someone explain to me why I get so different histograms, in terms of
> bar spacing, depending on the number of counts entered ? (see example
below)
>
>
>
>> test <- c(0,1,1,1,1,0,0,0,0,0,2,3,2,2,2,3,3,4,5,6,7,5,4,3,4,2,2)
>
>> hist(test)
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>
>
> I obtain this kind of histogram (what I actually want), i.e. large bars
with
> no space between them
>
>
>
> x
>
> xx
>
> xxx
>
> xxxx
>
> xxxxx
>
> xxxxxx
>
> xxxxxxx
>
> xxxxxxxxx
>
> xxxxxxxxxx
>
>
>
> Entering:
>
>> test <-
>
c(3,1,2,1,1,1,2,1,1,2,2,2,0,1,1,1,3,0,0,2,5,2,0,0,1,6,0,1,1,4,0,0,2,1,0,1,3,
>
0,0,0,3,2,1,3,6,3,1,0,1,0,1,0,1,0,0,4,1,3,2,7,5,1,0,0,1,2,0,2,0,2,0,2,1,1,3,
>
1,3,0,2,1,3,1,1,0,1,7,2,1,2,2,2,1,2,5,1,2,2,2,1,1,4,2,0,4,1,1,1,5,1,0,2,5,2,
>
1,1,1,1,2,1,1,1,1,4,2,1,3,1,1,2,4,2,1,1,1,1,1,1,1,1,1,4,1,0,2,2,5,1,4,0,1,2,
>
2,2,2,1,2,1,3,5,2,0,0,2,0,0,0,0,1,1,2,2,1,1,2,1,0,1,0,2,1,3,0,0,0,1,3,1,3,1,
>
0,3,1,2,0,1,1,1,3,4,4,2,1,1,1,2,1,2,2,5,1,1,1,1,1,2,0,1,3,1,1,2,3,1,1,2,0,0,
>
2,0,1,1,1,1,1,1,1,1,1,1,5,3,1,1,1,0,0,1,0,1,1,0,0,1,2,0,0,0,2,3,1,1,1,2,0,0,
>
0,0,0,0,0,0,0,0,0,0,0,0,1,1,2,0,1,0,0,0,1,3,0,1,3,1,2,1,1,2,1,1,3,1,1,1,0,0,
>
1,1,1,1,1,1,1,1,4,1,3,3,1,2,1,2,3,4,1,0,2,2,1,2,1,2,3,0,0,2,3,2,4,1,0,1,1,0,
>
1,3,2,3,3,1,3,1,0,2,1,1,1,1,1,1,3,0,0,1,1,1,1,1,1,3,1,3,3,0,1,2,1,2,3,1,2,1,
> 2,2,2,1,1,1,1,0,2,2,1,2,2,2,1,1,2,2,1,1,1,2,2,1,1,1)
You data follows a *discrete* distribution, hence a barplot seems to be
more appropriate here:
barplot(table(testtest))
Uwe Ligges
>> hist(test)
>
>
>
> I obtain a strange histogram with the first 2 bars grouped together and
then
> thin bars (not occupying the entire bin width) separated by spaces.
>
>
>
> x
>
> x x
>
> xx x
>
> xx x x
>
> xx x x x
>
> xx x x x x
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> xx x x x x
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> xx x x x x x
>
> xx x x x x x x
>
> xx x x x x x x x x
>
>
>
> I suspect that it?s causing me some troubles to fit my data to a
probability
> density function. Using:
>
>
>
>> plot(density(test))
>
>
>
> I got a ?wave-shaped? density line, with the line going down to zero
between
> each bar. And I wouldn?t expect the density line to go down between each
> integer? or surely there is something that I don?t understand!
>
>
>
> Thanks for your help,
>
>
>
> Am?lie Lescro?l
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> [[alternative HTML version deleted]]
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