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ummonk • today at 8:38 PM • 3 replies • view on HN

If you only measure median performance as this is doing, do any group of individuals' stock trades beat the market? I'd expect most of the alpha to come not from the median transaction but from a few well timed buys or sales.


Replies

lesuorac • today at 8:57 PM

It’s also not the market. It’s a SNP comparison.

But at the same time, if I buy a bunch of NVDA stock and lobby congress to loosen export rules and fail then I’ll have a bad return but its still not behavior we want.

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kennywinker • today at 8:40 PM

From the discussion section:

> It does not show that no member ever trades on what they know: a few well-timed trades can hide inside thousands of ordinary ones, and this test looks at the typical trade, not the best one.

wodenokoto • today at 9:05 PM

But if you look at the well timed transactions and compare that to the market then … the market will beat the market.