Transformation of random variables
From HandWiki
If X is a random variable described by the probability density f(x), and if Y=Y(X) then
is the probability density of y. For a transformation of several random variables File:Hepa img1080.gif into File:Hepa img1081.gif one has
where File:Hepa img1083.gif is the Jacobian or Jacobi Determinant of the transformation.