[Rivet] Rivet "collaboration meeting"?

[David Grellscheid]

> We calculate the error on a given bin as something like
> s^2 = sum(w^2)/n^2, cf.

> Why is this not using the normal variance a la
> s^2 = 1/(n-1) <(w-<w>)^2>
>    = 1/(n-1) (<w^2> - <w>^2)
>    = 1/(n-1) (sum(w^2)/n - sum(w)^2/n^2)

Simon pointed this out to me last week, too, saying that for low-filled
bins the current value is way off. We need to look at that again.

  David