I have just a few simple comments about naming.
The Stat library could really live anywhere. It only contains functions for mean, median, variance, and std. dev.
I suggest the fuller name 'Statistics', and indeed it does not belong under DSP. Possibly under Numeric, but maybe at the top level?
The Poly library could have a home somewhere else because it could be of use to people outside of DSP. Some people had suggested making it a subclass of Num.
'Poly' what? Polymorphic? Polynomial?
Numeric Transform DFT -- Discrete Fourier Transform DCT -- Discrete Cosine Transform DST -- Discrete Sine Transform DHT -- Discrete Hartley Transform
How about Numeric DiscreteTransform Fourier Cosine Sine Hartley
Numeric Random Generators -- MT19937, DRAND48, ... PDF -- Uniform, Normal, Poisson, Rayleigh, ... Spectral? -- White, Pink, Red, ...
PDF = Adobe Portable Document Format? No? Then what? My guess is Psomething Distribution Function, so how about Numeric.Random.Distribution? Regards, Malcolm