I answered this yesterday: please see the archives.
Nick
[email protected]
Wallace, John
Having found my wayward graphics manual, I've located the answer to my first question: the default values are the calculations proposed by Tukey in his 1977 text, Exploring Data Analysis. The distance to the adjacent values is a multiple of the IQR (3/2 * (75th% - 25th%)). It doesn't look like there is an explicit way to change this (make it 3SD, for example). Does anyone know if this is ado-able, or is the graphics engine that generates the boxplot not accessible this way?
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