[R] Question about which kind of plot to use

From: Max <mnevill_at_exitcheck.net>
Date: Wed, 19 Dec 2007 14:43:35 -0800


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.

thanks,

-Max



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