[R] Odp: outlying

[Petr PIKAL]

Hi

It often depends on your attitude to  limits for outlying observations. 
Boxplot has some identifying routine for selecting outlying points.

 Any procedure usually requires somebody to choose which observation is 
outlying and why. You can use e.g. all values which are beyond some 
threshold based on sd but that holds only if distribution is normal.

set.seed(1)
x<-rnorm(x)
ul <- mean(x) +3*sd(x)
ll <- mean(x) -3*sd(x)
beyond <- (x>ul)  | ( x <ll)

> x[beyond]
[1] 3.810277

Regards
Petr

petr.pikal at precheza.cz

r-help-bounces at stat.math.ethz.ch napsal dne 19.06.2007 11:29:17:

> hello,
> are there functions to detecte outlying observations in samples?
> thanks.
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