On Saturday 14 August 2010 23:08:31 Peter Dalgaard wrote: > Johannes Graumann wrote: > > Hi, > > > > can someone point me at material to understand how in > > http://upload.wikimedia.org/wikipedia/commons/8/89/Boxplot_vs_PDF.png the > > "fivenum"-corresponding percentages might be calculated? > > Looks like a pretty straightforward application of pnorm() and qnorm(). > > pnorm(4*qnorm(.75), lower=F) # Q3 + 1.5 IQR = 4 Q3 since IQR = 2 Q3 > > [1] 0.003488302 > > gives the tail probabilities of .35%, and the rest is by definition.
Thanks a lot! Joh
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