Hello,

You need to be much more specific. What do you know about the distributions of X and Y? And about their joint distribution?

If you suspect the joint distribution to be a bivariate normal try package mvtnorm with

mu <- c(mean(x), mean(y))
sigma <- cov(cbind(x, y))


You can also try kernel density estimates:

library(sos)
findFn('kde')


Hope this helps,

Rui Barradas

Em 25-01-2013 18:13, eliza botto escreveu:

Dear R family,
I want to calculate the joint probability (distribution) of two random 
continuous variables X and Y.
Could to please tell me how to do it?Thanks in advance..
elisa                                   
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