Hi,
Newbie here. I read the R for Beginners but i still don't get this.
I have the following data (this is just an example) in a CSV file:
courseid numstudents
101 209
141 13
246 140
263 8
321 10
361 10
364 28
365 25
366 23
367 34
I load my data using:
fs<-read.csv(file="C:\\num_students_inallmodules.csv",header=T, sep=',')
I want to get the ecdf. So, I looked at the ?ecdf which says usage:ecdf(x)
So I expected ecdf(fs$numstudents) to work
Instead it just returned:
Call: ecdf(fs$numstudents)
x[1:210] = 1, 2, 3, ..., 3717, 4538
After Googling, got this to work:
ecdf(fs$numstudents)(unique(fs$numstudents))
But I don't understand why if the ?ecdf says usage is ecdf(x) ... I
need to use ecdf(fs$numstudents)(unique(fs$numstudents)) to get this
to work?
Can somebody explain this to me?
Regards
Gawesh
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