wespiserA
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 Sep 24 awarded Autobiographer May 16 comment $u$~$N(0,A)$ and z$|u$~$N(u,1)$ how to show that $u|z$~$N(Bz,B)$ where $B=A/(A+1)$? Hello, I am interested in solving the same problem, is there a good guide I can use to better understand the manipulation of the u ~ N(0,A) type objects? Thank you Jul 4 revised Multivariate Hypergeometric Distribution Questions added working solution Jul 4 asked Multivariate Hypergeometric Distribution Questions Oct 25 awarded Editor Oct 25 revised Simple probability for test studying strategy added 241 characters in body Oct 25 comment Simple probability for test studying strategy @Joriki, you are correct. This is the information as I have found. Oct 25 asked Simple probability for test studying strategy Oct 13 awarded Scholar Oct 13 accepted Probability of occurrence of 4 letters in a sample of text Sep 28 awarded Supporter Sep 24 comment Probability of occurrence of 4 letters in a sample of text @mixedmath, yes you are correct. I am working the problem now as a didactic exercise then will get to that. If you have a solution with P(x) probabilities, please share! Sep 24 awarded Student Sep 24 comment Probability of occurrence of 4 letters in a sample of text so what should the equation for B(20) be? I'm a little confused whether my math, or calculation is off. Sep 24 comment Probability of occurrence of 4 letters in a sample of text just to make sure i'm on the right track here, plugging in values would make B(n) = ( ( 23 * (expt 4 19)) + ( 4 * (expt 22 19))) = 128259908852079784775122944 Sep 24 comment Probability of occurrence of 4 letters in a sample of text thank you! I'll run this through Haskell to avoid floating point errors! Sep 24 asked Probability of occurrence of 4 letters in a sample of text