[R] How to return/show the indexes of unusual points in boxplot?

[jim holtman]

boxplot returns a dataframe that has the values in it at "$out":

> x <- boxplot(c(4,rnorm(20),8))
> x
$stats
           [,1]
[1,] -1.5364498
[2,] -0.5282799
[3,] -0.1398736
[4,]  0.3065579
[5,]  1.3430388

$n
[1] 22

$conf
           [,1]
[1,] -0.4210947
[2,]  0.1413474

$out
[1] 4 8

$group
[1] 1 1

$names
[1] "1"



On Wed, Sep 9, 2009 at 3:25 PM, <guox at ucalgary.ca> wrote:
> I am wondering if you know how to return by function or show in boxplot,
> the indexes of unusual points, such as,
> points that are outside the box or in [Q3+1.5IQR,Max].
> For example,
>
>> boxplot(c(4,rnorm(20),8))
>
> There are 2 unusual points 4 and 8. How to show the indexes of 4 and 8 in
> the boxplot
> or return them by function?
>
> Thanks,
>
> -james
>
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>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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