[R-sig-teaching] graphing circles

[Jeff Laux]

It doesn't seem silly to me; this is a standard figure/metaphor for 
teaching reliability & validity.  You could make such a figure in R, but 
I would probably just use a drawing program (e.g., Serif, which can be 
downloaded for free).  Alternatively, you could just search the internet 
for one, as I've seen several versions of this before.  -Jeff


On 3/25/2012 8:59 AM, AbouEl-Makarim Aboueissa wrote:
> Dear R users:
>
> It may be a silly question. I am trying to create a target diagram of 4 circles inside each other and adding some dots to describe different situations of validity and reliability. I need three of them.
>
> one with all dots around the target.
> one with all dots in about one place, but far from the target.
> one with randomly scattered dots.
>
>   I tried my best, but could not succeed. Can someone help me with creating such graph.
>
> Thank you very much
> abou
>
>
>
> ==========================
> AbouEl-Makarim Aboueissa, Ph.D.
> Associate Professor of Statistics
> Graduate Program Coordinator
> Department of Mathematics&  Statistics
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