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It's from my analysis of embryo selection (https://www.gwern.net/Embryo-selection). But you can do it without the complications by treating it as an order statistic (https://en.wikipedia.org/wiki/Order_statistic): what is the expected maximum of a sample of 5 Gaussians (rough current average egg harvest) vs 20 or 100 Gaussians, where the Gaussian is N(0, 0.5 * sqrt(polygenic score))? (Since you are selecting on the polygenic scores, not the unknown adult scores, and 0.5 because you are selecting from embryos which are 50% related ie. siblings.) X_5 vs X_100 is a big difference.

(To save you the trouble, it's +1.16SD vs +2.51SD; the difference is actually much bigger than it looks because you lose so many embryos in the IVF process, so it's really more like X_1 vs X_196 or +0.56 vs +2.48SD, but to be more precise, you need to go into the weeds of PGSes and per-stage losses in IVF etc. But the order statistics are a good starting point.)

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