(This article was first published on

This plot:**Learning R**, and kindly contributed to R-bloggers)was created using the following R code:

plot (q9e~q8, type = "n",

xlim = c(1,13), ylim = c(1,13),

cex.lab=1.25,cex.axis=0.75,

col.lab = "#333333",

xlab = "Obama job grade",

ylab = "Congressional job grade",

xaxt ="n", yaxt="n",

main="Obama and Congressional 100 day job grades")

abline (or,lwd=2,col="red")

abline (od,lwd=2,col="blue")

axis(1,at=c(1,2,3,4,5,6,7,8,9,10,11,12,13),

lab=c("A+","A","A-","B+","B","B-","C+","C","C-","D+","D","D-","F"),

col.lab="#333333", col.axis="#333333", tck=-0.02, cex.axis=0.75)

axis(2,at=c(1,2,3,4,5,6,7,8,9,10,11,12,13),

lab=c("A+","A","A-","B+","B","B-","C+","C","C-","D+","D","D-","F"),

col.lab="#333333", col.axis="#333333", tck=-0.02, cex.axis=0.75)

text (5,6, "Democrats",col="blue")

text (4,9.5, "Republicans",col="red")

text(3,1,"Source: CNN/ORC Poll, April 2009",col="#777777",cex=0.75)

To

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