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643 B
643 B
slug | sidebar_position |
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/en/sql-reference/aggregate-functions/reference/varsamp | 33 |
varSamp
Calculates the amount Σ((x - x̅)^2) / (n - 1)
, where n
is the sample size and x̅
is the average value of x
.
It represents an unbiased estimate of the variance of a random variable if passed values from its sample.
Returns Float64
. When n <= 1
, returns +∞
.
:::note
This function uses a numerically unstable algorithm. If you need numerical stability in calculations, use the varSampStable
function. It works slower but provides a lower computational error.
:::