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regarding "minimising unnecessary turnover": how do you know turnover is unnecessary without introducing lookahead bias?
Simple example would be, A can be traded as a spread vs B or C. If you currently have an A/B spread on with weak signal and the signal for an A/C spread is strong but not enough to put a trade on yet, rather than trading out of the A/B spread it may be better to
trade a B/C spread to get into a B/C position early. Essentially thinking about the whole portfolio rather than individual positions.
sounds reasonable. thanks
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