[R] Algorithms for coincidences

[Greg Snow]

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
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] 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
> 
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