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varPopStable

varPopStable

Returns the population variance. Unlike varPop, this function uses a numerically stable algorithm. It works slower but provides a lower computational error.

Syntax

varPopStable(x)

Alias: VAR_POP_STABLE.

Parameters

Returned value

  • Returns the population variance of x. Float64.

Example

Query:

DROP TABLE IF EXISTS test_data;
CREATE TABLE test_data
(
x UInt8,
)
ENGINE = Memory;

INSERT INTO test_data VALUES (3),(3),(3),(4),(4),(5),(5),(7),(11),(15);

SELECT
varPopStable(x) AS var_pop_stable
FROM test_data;

Result:

┌─var_pop_stable─┐
│ 14.4 │
└────────────────┘