Re: [R] Choice of notch size in R

From: <Richard.Cotton_at_hsl.gov.uk>
Date: Mon, 21 Apr 2008 10:59:42 +0100


> Is there a way to modify the choice of notch size [1] in R's boxplot
> routine from outlining a 5% significance region, to say 1% or lower?

Yes, but it's not as simple as specifying the significance level. You'll have to update the function boxplot.stats, specifically the line conf <- if (do.conf) stats[3] + c(-1.58, 1.58) * iqr/sqrt(n)

Then you either need to modify boxplot to find your version of boxplot.stats, or call bxp (the low-level plotting function that boxplot calls) directly.

Regards,
Richie.

Mathematical Sciences Unit
HSL



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