I still have to finish writing the explanations for rebalancing and walk forward testing as it applies to PI 3.0. As soon as I finish I'll make it available.
The rebalancing engine uses standard rebalancing methods but is a bit more complicated to explain because it operates on 2 levels (long-term and short-term), so I can't point you to anything that fully explains it right now. However I will have a full explanation in the next few weeks.
I've set up a blog here --> http://aptusblog.wordpress.com/ where I plan to post the explanations. I'll also post an update here when the blog entries are ready.
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