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MathGroup Archive 1995

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Random[BinomialDistribution[..]] wrong ?

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg1051] Random[BinomialDistribution[..]] wrong ?
  • From: bzbkowal at zib-berlin.de (Axel Kowald)
  • Date: Fri, 12 May 1995 13:50:41 -0400
  • Organization: Konrad Zuse-Zentrum fuer Informationstechnik Berlin

Hello

I'm using Mathematica 2.2 on a Macintosh and I got a problem generating binomially
distributed random numbers.

I have:

Needs["Statistics`DiscreteDistributions`"]
SeedRandom[17]
Table[Random[BinomialDistribution[10^6,0.01]],{5}]
Out-> {998486, 998486, 998486, 998486, 998486}

Not only that the random numbers are all the same, most importantly they are in a 
completely wrong range. One should get something around 10000 !
The problem seems to be 10^6, if I use something smaller, like 10000, everything works
fine. Furthermore the problem seems to be in the Random[] function since
PDF[BinomialDistribution[10^6,0.01],n] works okay (but takes a long time).

Any comments, hints, solutions ?

Many thanks

	Axel Kowald





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