From: Ted Harding <Ted.Harding_at_nessie.mcc.ac.uk>

Date: Tue 12 Jul 2005 - 19:27:17 EST

*>
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> Not definitively detectable of course, but certainly suspectable.

*>
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*> Hint: What is the relationship between the distances from the "median"
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*> line to the extremes of the "box", and from the extremes of the "box"
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*> to the ends of the "whiskers", in the case of a uniform distribution?
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*>
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*>
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*>
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*> If that doesn't trigger it, then:
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*>
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*> Hint:
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*>
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*> unimod<-rnorm(1000,0,sqrt(26))
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*> nomod<-sqrt(12*26)*runif(1000)
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*> boxplot(data.frame(cbind(unimod,nomod,bimod)))
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E-Mail: (Ted Harding) <Ted.Harding@nessie.mcc.ac.uk> Fax-to-email: +44 (0)870 094 0861

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jul 12 19:38:30 2005

Date: Tue 12 Jul 2005 - 19:27:17 EST

On 12-Jul-05 Ted Harding wrote:

> On 12-Jul-05 Spencer Graves wrote:

>> I'll bite: How does one detect bimodalidty from a boxplot? >> >> spencer graves >> >> Berton Gunter wrote: >> [...] >>> Finally, a tidbit for boxplot afficianados: how does one detect >>> bimodality from a boxplot? >>> >>> -- Bert Gunter

> Not definitively detectable of course, but certainly suspectable.

OOPS!! (cut-&-pasted the wrong lines):

unimod<-rnorm(1000,0,sqrt(26))

nomod<-sqrt(12*26)*(runif(1000)-0.5)

bimod<-c(rnorm(500,-5,1),rnorm(500,5,1))
boxplot(data.frame(cbind(unimod,nomod,bimod)))

> Best wishes,

*> Ted.
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E-Mail: (Ted Harding) <Ted.Harding@nessie.mcc.ac.uk> Fax-to-email: +44 (0)870 094 0861

Date: 12-Jul-05 Time: 10:24:34 ------------------------------ XFMail ------------------------------ ______________________________________________R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jul 12 19:38:30 2005

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