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Experimentian with Bayesian statistics

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  • Subject: [mg45377] Experimentian with Bayesian statistics
  • From: NA <nospam at>
  • Date: Sun, 4 Jan 2004 04:56:09 -0500 (EST)
  • Sender: owner-wri-mathgroup at

I'm trying to learn some basic Bayesian statistics with Mathematica but I'm
having trouble building up the probability formulae that I need.

I tried to define

depPr[x_,y_] := (Pr[x] depPr[y,x]) / Pr[y]

but I don't even get an Out result  (I thought it would have at least
redisplayed it with numerator over denominator)

(I assumed by the way that I needed a different name for the function   Pr{x
| y} vs the simple  Pr{x})

If I replace the ':=' with '=', then I just get a recursion error.

I've looked around on the web but there doesn't seem to be very much out
there on doing probability with Mathematica

Once I get this working, then I want to extend it (symbolically) so that I
can work with sequences of events,  i.e.

Pr{Xi | Y} = Pr{Xi}*Pr{Y|Xi}
                    Sigma(Pr{Xi}*Pr{Y|Xi}, 1, n)

and then create lists of items to run through it.

Bit difficult when I can't even get the basics running.

Any suggestions would be appreciated,

Jen B.


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