A paper that may help you: "Methods for Studying Coincidences", Persi Diaconis; Frederick Mosteller. Journal of the American Statistical Association, vol 84, no. 408 (Dec., 1989), 853-861.
And remember that the birthday problem assumes independence, but if you have 2 students that studied together (legitimately) then we would not expect their scores to be independent. Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Doran, Harold > Sent: Tuesday, November 06, 2007 12:10 PM > To: r-help > Subject: [R] Algorithms for coincidences > > I'm looking at algorithms for determining coincidences. In > educational testing, it is interesting to look at cheating > via the birthday problem where I can assess the probability > of n students having the same test score in a class of size k. > > I was writing my own code for the b-day problem until I ran into the > qbirthday() function, which has solutions for the overflow > problems I kept running into. There is no "see also" part of > this man page which would reference me to other functions > which may prove useful for such problems. But, that doesn't > mean they don't exist. > > I am just not familiar enough with this branch of mathematics > to know exactly what else I might look for. Does anyone know > of any other R functions that may be useful for me to look at > in thinking about this kind of problem? > > Harold > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
