statsmodels/statsmodels — pull request #1271 by Padarn (2013-12-27 01:23:22+00:00)
Title: Silverman enhancement - Issue #1243 

This PR is to add the kernel dependent constants for the silverman bandwidth as discussed in Issue #1243.

Not sure about the style of the functions which are only implemented for order 2 kernels right now.

I've added some tests, which test against the values given in the notes (only given to 2 dp). But really I just intended these as a place holder for more useful bandwidth tests.