I've read both of those and unfortunately both are severely lacking. They cover the basic ideas (which are essentially trivial) in a long-winded way but then completely ignore implementation issues and the success factors determining the profitability of stat arb trades, which are the parts that actually make the money.
There are a couple of interesting academic papers (just search for pairs trading/statistical arbitrage on google scholar) but they too are really lacking useful info in the most important areas...at least they're short though.
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Post is a little old but if still interested, I had done a lot of stat arb for a few years when with a prop firm, VERY capital intensive, thus potentially running high haircut fees or in pairs such as CMCSA-CMCSK, where you are shooting for a few pennies, potentially costly commission fees.
Whatever you do, best of luck in your direction
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