[R] CDF plot

[Douglas Bates]

On 7/6/05, huang min <minhuangr at gmail.com> wrote:
> Dear all,
> 
> I have define a discrete distribution P(y_i=x_i)=p_i, which I want to
> plot a CDF plot. However, I can not find a function in R to draw it
> for me after searching R and R-archive. I only find the one for the
> sample CDF instead my theoretical one.
> 
> I find stepfun can do it for me, however, I want to plot some
> different CDF with same support x in one plot. I can not manage how to
> do it with stepfun.
> 
> Is there any existing function in R to draw the theoretical CDF plot?
> Or how to abline other step functions in stepfun? Thanks.

The type = 's' option to the plot function is used to create the
"stairstep" plot of a cumulative distribution function.  Try

> x <- 0:10
> Pr <- pbinom(x, size = 10, prob = 0.314)
> data.frame(x = x, Pr = Pr)
    x         Pr
1   0 0.02308028
2   1 0.12872474
3   2 0.34632766
4   3 0.61193435
5   4 0.82469072
6   5 0.94155166
7   6 0.98612689
8   7 0.99778589
9   8 0.99978712
10  9 0.99999068
11 10 1.00000000
> plot(c(-0.3, x), c(0, Pr), type = "s", xlab = "x", ylab = "P", main = "Cumulative distribution function", las = 1)