Hello,
Inline
Em 18-07-2012 18:44, Nordlund, Dan (DSHS/RDA) escreveu:
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
project.org] On Behalf Of Sajeeka Nanayakkara
Sent: Wednesday, July 18, 2012 6:28 AM
To: r-help@r-project.org
Subject: [R] R code for to check outliers
What is the R code to check whether data series have outliers or not?
Thanks,
Sajeeka Nanayakkara
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Sajeeka,
You have been given lots of good information and appropriate warnings. Let me
add another caveat to think about in the context of outliers/unusual values. A
value may only be unusual in a multivariate context. If we have a dataset with
human heights in it, a value of 73 inches would not be unusual. If we then
learned that this particular individual was female, it would be somewhat
unusual but certainly within the realm of possibility.
Uma Thurman!
If we then learn that the individual is 3 years old, it would be highly
unusual.
So, you can see why people on the list are somewhat unwilling to say here is THE function
"to check whether data series have outliers or not."
Now having said that, can you define what YOU mean by "outlier" and why you are
concerned about finding them. Someone may be able to offer advice that will help you
achieve your goal.
Agreeing with what has being said and not wanting to misdirect no one,
there's a function in the graphics package that gives outliers, boxplot.
They are computed based on boxplot.stats so see
?boxplot.stats
in particular the parameter coef and it's default value.
See also the return values from both these functions.
Rui Barradas
Dan
Daniel J. Nordlund
Washington State Department of Social and Health Services
Planning, Performance, and Accountability
Research and Data Analysis Division
Olympia, WA 98504-5204
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