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1.2 KiB
slug | sidebar_position |
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/en/sql-reference/aggregate-functions/reference/stddevpopstable | 189 |
stddevPopStable
The result is equal to the square root of varPop. Unlike stddevPop
, this function uses a numerically stable algorithm. It works slower but provides a lower computational error.
Syntax
stddevPopStable(x)
Parameters
Returned value
Square root of standard deviation of x
. Float64.
Example
Query:
DROP TABLE IF EXISTS test_data;
CREATE TABLE test_data
(
population Float64,
)
ENGINE = Log;
INSERT INTO test_data SELECT randUniform(5.5, 10) FROM numbers(1000000)
SELECT
stddevPopStable(population) AS stddev
FROM test_data;
Result:
┌─────────────stddev─┐
│ 1.2999977786592576 │
└────────────────────┘