hello,
i want to do a binomial simulation, by taking 200 var. from one group (x)
and 300 from another (y).
the prob. for disease=.6 in both groups.

x <- rbinom(200, 1, .6)

y <- rbinom(300, 1, .6)
if the person is from group x - the probability to find the disease,
assuming the person is sick, is .95,
if he is from group Y its .80.
i want to know the joint probability: p(the person has the disease and
tested sick)=P(D+,T+).
my problem is how to write the conditional prob.
Thanks for your help, also reference on this subject (binomial simulation)
would be great.
Sigalit.

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