Given a large sequence of data $X$, what is the fastest method to check if:
1) $Var(X) = 0$
or
2) $Var(X) \neq 0$
Thanks.
2026-04-01 01:34:58.1775007298
Variance of a large sequence
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$Var(X)=0$ if and only if all data have the same value. Track min and max of the numbers you have already checked. When min $\ne$ max, you know $Var(X) > 0$.