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silwoodweather
2009 Jul 12
2
box and whisker (PR#13821)
In a Box and Whisker plot, I thought that when there are outliers both abov=
e and below the whiskers, then the whiskers should both be the same length =
(plus or minus 1.5 times the inter-quartile range).
If you look at the plot for SilwoodWeather on p.155 of The R Book you will =
see that for November (month =3D 11) the upper whisker is shorter than the =
lower, while for other months with outliers both above and below, the lines=
are the same lengths.
When there are no outliers, then of course the maximum and minimum values r=
esult in...