denotes the joint probability distribution of two continuous random variables X and Y.
I had to miss class today due to another engagement and in learning what I missed on Bivariate Probability Distributions I've come across this notation.
Is this another notation for a function of two variables or does it denote partial derivatives?
Or something else?
Thanks for the clarification!
These are not partial derivatives.
We use the subscripts since one bivariate density generates 4 more densities, the two marginals and the two conditionals.
Thus, there are five densities and we use f for all five.
The subscripts "differentiates" an excellent pun, which density is which.
BUT there is no differentiation here at all.
NOW, f is the derivative of F, the cdf........