FWIW, I'm planning on moving away from this object and towards the ufuncs in breeze.linalg (possibly moving them to breeze.stats): https://github.com/scalanlp/breeze/blob/master/src/main/scala/breeze/linalg/mean.scala

(There's also a cov sitting in the package object for a DenseMatrix, but it needs to be generalized some.)

That's not to say I'm not happy to take these, just that probably this API will be deprecated before too long.