so now the question is: is the chance for 10000 out of 30000 the same as 1 out of 3. oh wait, that's 1... guess not :D On 06/25/2010 02:58 PM, Michiel Van Bel wrote:
Frederik Delaere wrote:
Michiel Van Bel wrote:
okay, my statistics is a bit rusty (and I do not really know how to google for it), so perhaps you guys might have a hint:
1) say you have X objects (in a linear row) 2) Y of those X objects (Y<= X naturally) have some kind of special status 3) Z is a number between 0 and Y 4) What are the odds that Z objects with the special status are located next to each other
For example: X=50,Y=20,Z=10 You have 50 pencils, and 20 of them are red, 30 of them are blue. What are the odds that (if you lay those 50 pencils down randomly) there are 10 red pencils next to each other?
Anyone any hints?
ask in the forums on unibet.com ?
okay, if I follow Marijn's reasoning: I get that the chance is approx. (N-Z) * (Y!) / ((N-Z)!) This should be great, except for the fact of course that N and Y are pretty big numbers (N : 30000 genes, Y : 10 to 10000 GO terms), and Z is pretty small (10 or so). 30000! is a rather largish number actually :-/
-- ================================================================== Marijn Vandevoorde Tel:+32 (0)9 331 36 95 fax:+32 (0)9 3313809 VIB Department of Plant Systems Biology, Ghent University Technologiepark 927, 9052 Gent, BELGIUM marijn.vandevoorde@psb.vib-ugent.be http://www.psb.vib-ugent.be ================================================================== "Fat bottomed girls, you make the rockin' world go round." --F. Mercury