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
That depends on what you meant by writing the conditional probability.
Bayes rule says that the probability of testing positive when one has the
disease is calculated as follows:
Pr(T+ | D+)=(Pr(D+ | T+)*Pr(T+))/Pr(D+)
is that what you mean?
Kyle H. Ambert
Department of Behavioral
I have the probability: P(T+ / D+)
i want to find P(T+,D+) which is: P(T+ / D+)*P(D+) and i have those
probabilities. i dont know how to write this in R.
something like this: (say p2 is the conditional prob. and p1 is the joint
prob.)
p2 - p1/.6
x - rbinom(200, 1, .6)
y - rbinom(300, 1, .6)
if
: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
sigalit mangut-leiba
Sent: Wednesday, August 08, 2007 11:18 AM
To: r-help
Subject: Re: [R] simulation-binomial
I have the probability: P(T+ / D+)
i want to find P(T+,D+) which is: P(T+ / D+)*P(D+) and i have
those probabilities. i
Intermountain Healthcare
[EMAIL PROTECTED]
(801) 408-8111
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
sigalit mangut-leiba
Sent: Wednesday, August 08, 2007 11:18 AM
To: r-help
Subject: Re: [R] simulation-binomial
I have the probability: P(T
