I think this is what you are getting at. Hope this helps.
#index data to determine what low and high levels of tvHrs are (I said
anything over 15 hours is considered 'high')
index=which(tvHrs > 15)
#Plot the first plot, which is the 'high', only using values from crimeDvp
that are in 'index' (corresponding to high levels of tvHrs
plot(prop.table(table(crimeDvp[index])),type='b',ylab='percent',xlab='crime
dev',col='red')
lines(prop.table(table(crimeDvp[-index])),type='b', col='black')
lines(prop.table(table(crimeDvp)),type='b',col='green')
legend("topright", inset=.05, title="TV consume", c("high","low","all"),
fill=c('red','black','green'))
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