Re: [R] Question about which kind of plot to use

From: Jim Lemon <jim_at_bitwrit.com.au>
Date: Thu, 20 Dec 2007 17:58:56 +1100

Max wrote:
> Hi Everyone,
>
> I've got a question about data representation. I have some psychometric
> data with 5 scores for 15 different groups. I've been asked to show
> some kind of mean plots. The data below is the mean and SD for a given
> group, unfortunately my employer doesn't want me posting full datasets.
> :(
>
> The groups V,W,X,Y,Z are divided into Bottom, (B), Middle (M) and Top
> (T). An example of my data is shown below.
>
> Score 1
> Mean SD
> B M T B M T
> V 86.9 13.0 88.8 16.9 2.0 10.5
> W 16.1 96.1 17.7 2.2 4.6 1.7
> X 50.7 61.1 74.7 4.7 3.7 7.6
> Y 68.5 99.7 37.6 6.0 8.0 2.3
> Z 92.7 22.3 69.4 6.5 1.2 2.2
>
> What I did before was a standard mean plot:
>
> plotMeans(w$score1, w$Factor,
> error.bars="sd",xlab="Factor",ylab="Score",main="Group W Score 1 Plot")
>
> However, with 15 groups and 5 scores this turns into 75 individual
> graphs. Is there a way to layer mean plots? Or show several mean plots
> in the Same graph? Any ideas or suggestions would be great.
>
Hi Max,
This may get a bit crowded, but brkdn.plot (plotrix) will do something like this. I think you would want your group variable as the "groups" argument (!) and the variable that specifies Bottom/Middle/Top as the "obs" argument. Pass "sd" as the "md" argument to get standard deviation bars.

Jim



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