Hi,
I have a question for the group, perhaps someone can help me figure this out. I've already looked in the help files and they were no help to me.
I have a vector of values and I am plotting an ecdf graph.
1. How can i draw a continuous line through the ecdf points? (lines and type for the plot with an ecdf object does not work)
Well, the help page ?plot.ecdf and ?plot.stepfun is pretty clear and tells us to use verticals = TRUE.
From the help page:
F10 <- ecdf(rnorm(10)) plot(F10, verticals = TRUE, do.p = FALSE)
2. Supposing I have this line drawn. I can add a vertical line of a known x value which intersects the graph. How can I determine the y value of the graph point that is intersected by the abline?
Use knots(), e.g. by extending the former example as follows:
kF10 <- knots(F10) sum(kF10 <= x) / length(kF10)
Uwe Ligges
Any help would be appreciated.
Thanks in advance, Monica
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