Re: [R] mean in the boxplot

From: Peter Ehlers <ehlers_at_ucalgary.ca>
Date: Fri, 01 Apr 2011 13:53:00 -0700

On 2011-04-01 10:28, David Winsemius wrote:
>
> On Apr 1, 2011, at 1:20 PM, Yan Jiao wrote:
>
>> Dear R users,
>>
>> How to show mean in the boxplot instead of median ?
>
> Read ... help(boxplot)
>
> Use boxplot to create a set of values, substitute th emean for the
> groups then pass the mangled set of values to bxp().
>

Another option is to add the means as points after plotting the boxplot with:

   boxplot(....)
   points(1:n, Means)

This is particularly useful if you want both the medians and the means on the plot. If you don't want the median line, you can get rid of it by setting medcol="transparent" in the boxplot() call.

But then again, the whole point of a boxplot is to represent general distributional shape for which the median is surely more effective.

Peter Ehlers



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