[R] p value for joint probability

Peter Ehlers ehlers at ucalgary.ca
Mon Jan 31 23:13:22 CET 2011

On 2011-01-31 12:42, moleps wrote:
> Dear all,
> Given
> rr<-data.frame(r1<-rnorm(1000,10,5),r2<-rnorm(1000,220,5))
> How can I add a column (rr$p) for the joint probability of each r1&  r2 pair?

If you take the values in each pair to be observations
from two independent Normal distributions, it's easy:
The "joint probability" of those values is zero.

But I suspect you mean something else by "joint probability".
Can you elaborate?

Peter Ehlers

>   I know how to add the column.. I just dont know how to compute the p value for joint probabilities given the two samples.
> //M
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