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Nov 9, 2014 at 14:20 comment added Yoav Kallus While this is correct, the number of measurements $n$ needed to estimate $S_2$ well is extremely large if indeed $N>10^{12}$. The good thing about $D$ was that it was cheap to estimate well.
Nov 9, 2014 at 14:17 vote accept Yoav Kallus
Nov 9, 2014 at 7:03 history answered Robert Israel CC BY-SA 3.0