It seems to have vanished off the web but a few years back Dupire published two tradable realized volatility estimators in 2015, I even asked a question around it here. What makes a realized vol estimate "tradeable"?
However, the only presentation I could find on the web has the formulas removed here: https://www.math.cmu.edu/CCF/CCFevents/shreve/abstracts/B.Dupire.pdf
Does any have the formulas for the two estimators or know why they are no longer available on the web?
Update:
Thanks to Pleb, we have one one of formulas, Dupire Realized Vol without night:
$\sigma_i = \frac{(H_i - C_i)^2 - (C_i - L_i)^2 }{2}$
Is it safe to assume Dupires formula with overnight is a follows?
$\sigma_i = \frac{(H_i - C_i)^2 + (C_i - L_i)^2 + (O_i - C_{i-1})^2}{3}$