I've uploaded a technical reference for the data mining system stored procedures to the SSAS community site on TechNet.
This information comes a bit late, I know, but many people had commented that these stored procedures, while enormously helpful, are not documented (by design) and thus information can be hard to find.
So in this guide I've documented the parameters to the best of my knowledge and collected some links to the many helpful samples of how to use them that were published by the data mining development team over the years.
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