11.5.3 Can you answer these questions?

11.5.3.1 Is there something like FindDistribution for many variables?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=310707

 FindDistribution  does not seem to work with multivariate data. Is there a way? I realize that I can use  SmoothKernelDistribution  ... 
[probability-or-statistics] [distributions]
 

asked by   https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=35000 Score of 2

11.5.3.2 Differentiating an inactive indexed sum returns 0 in Wolfram 14.2

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=310655

I recently encountered unexpected behavior when computing the derivative of an inactive indexed sum in Wolfram 14.2.0. This example is taken directly from the official documentation of ... 
[symbolic] [summation] [tensors] [differentials] [array]
                                                                                  

                                                                                  
 

asked by Pei-Xin Shen https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=66536 Score of 3

11.5.3.3 Catastrophic loss of precision when requesting higher precision on numerical RayleighDistribution approximation?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=310720

Context 
I am trying to find marginal distributions using $\delta_\mathrm{D}$. 
As a test case, I am trying to recover the Rayleigh Distribution for $r=\sqrt{x^2+y^2}$ when $x$ and $y$ are normally ... 
[calculus-and-analysis] [numerics] [diracdelta]
 

asked by chris https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1089 Score of 1