Hi r-users, I have 2 sets of data and I would like to superimpose this cumulative density in one graph. I know how to put the 2 graphs in one same graph but my problem is the data are different. > z[1:20] [1] 2.02347388 3.19514379 0.05188875 1.41333812 3.50249892 4.34272676 6.65639581 5.01533819 4.18207505 [10] 2.87615551 2.28202152 0.49431541 0.06570579 5.68352438 11.37222124 7.29185093 4.32209430 2.65243100 [19] 4.60515744 2.25838285 zgen dgen [1,] 10.04 0.9627 [2,] 10.05 0.9629 [3,] 10.06 0.9631 [4,] 10.07 0.9632 [5,] 10.08 0.9634 [6,] 10.09 0.9635 [7,] 10.10 0.9637 [8,] 10.11 0.9638 [9,] 10.12 0.9640 [10,] 10.13 0.9642 [11,] 10.14 0.9643 For z data, I can simply plot(ecdf(z)). But for data gen it is a 2 coulumn data, if I use scatter plot I can get the cdf, plot(zgen,dgen). I tried: plot(ecdf(z), verticals= TRUE,do.p = FALSE, main ="CDF for observed and simulated weighted sum", xlab="Weighted sum (mm)", ylab="Cumulative Percent", xlim=c(0,30), xaxs ='i', yaxs ='i') lines(c(zgen,dgen),verticals= TRUE,do.p = FALSE,col.h="red",col.v="red",lwd=2) legend(10,.2,c("obs","pre"),col=c("black","red"),lwd=c(1,2)) I do not get what I want. So how do I draw the 2 different ecdf on the same graph given 2 different set of data. Thank you so much for your help.
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