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POCreating a facet_wrap plot with ggplot2 with different annotations in each plot
 

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  1. POCreating a facet_wrap plot with ggplot2 with different annotations in each plot
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    <p>I am using ggplot2 to explore the result of some testing on an agent-based model. The model can end in one of three rounds per realization, and as such I am interested in how player utilities differ in terms of what round the game ends and their relative position in 2D space.</p> <p>All this is to say that I have generated a facet_wrap plot to show this for each round, but I would also like to annotate each plot with the cor(x,y) for the subset of data represented in each facet. Is there a way to tell ggplot2 that I would like the annotation to use the subset of data generated by facet_wrap? Here is the code I have so far, and what it is producing</p> <pre><code>library(ggplot2) # Load data abm.data&lt;-read.csv("ABM_results.csv") # Create new colun for area of Pareto set attach(abm.data) area&lt;-abs(((x3*(y2-y1))+(x2*(y1-y3))+(x1*(y3-y2)))/2) abm.data&lt;-transform(abm.data,area=area) detach(abm.data) # Compare area of Pareto set with player utility png("area_p1.png",res=100,pointsize=20,height=500,width=1600) area.p1&lt;-ggplot(abm.data,aes(x=area))+geom_point(aes(y=U1_2,colour="Player 1",alpha=0.4))+facet_wrap(~round,ncol=3)+ annotate("text",0.375,-1.25,label=paste("rho=",round(cor(abm.data$area,abm.data$U1_2),2)), parse=TRUE)+ scale_colour_manual(values=c("Player 1"="red")) area.p1+xlab("Area of Pareto Set")+ylab("Player Utility at Game End")+ opts(title="Final Player 1 Utility by Pareto Set Size and Round Game Ends",legend.position="none") dev.off() </code></pre> <p><a href="http://www.drewconway.com/zia/wp-content/uploads/2010/01/area_p1.png">area_p1 http://www.drewconway.com/zia/wp-content/uploads/2010/01/area_p1.png</a></p> <p>As you can see, there are two problems:</p> <ol> <li>The \rho value is of the full dataset, rather than the subsets by 'round'. Is there a way to get the cor(x,y) to print based on only the data shown in each plot?</li> <li>The annotation should read "\rho=some_value" but instead I get "=(\rho,value);" is there a way to fix this? </li> </ol>
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