Message-ID: <4B3F0B60.2040105@bitwrit.com.au>
Date: 2010-01-02T09:01:20Z
From: Jim Lemon
Subject: Boxplot- input the median point and the median value
In-Reply-To: <c895d7a51001011753t40b44983kdbb9d3316b893169@mail.gmail.com>
On 01/02/2010 12:53 PM, elaine kuo wrote:
> Dear,
>
> I am a newbie to R.
>
> Now I am learning to draw boxplot using graphics().
>
> I want to highlight the median position
>
> with a round point and the value left (or on the top of)to the point.
>
>
>
Hi Elaine,
For your boxplot questions, I'll use the first example from the boxplot
help page:
boxplot(count ~ spray, data = InsectSprays,
col = "lightgray",yaxt="n")
axis(2,c(2,8,14,20),c(2,8,14,20))
For the "dotted to solid" question:
boxplot_info<-boxplot(count ~ spray,
data = InsectSprays,col = "lightgray")
segments(rep(1:6,each=2),boxplot_info$stats[c(1,4),],
rep(1:6,each=2),boxplot_info$stats[c(2,5),])
And finally, for the median value question:
boxplot_info<-boxplot(count ~ spray, data = InsectSprays,
col = "lightgray")
points(1:6,boxplot_info$stats[3,])
text(1:6,boxplot_info$stats[3,]+1,boxplot_info$stats[3,])
A bit messy, but you get the idea.
Jim