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stddevPop

The result is equal to the square root of varPop.

Aliases: STD, STDDEV_POP.

Note

This function uses a numerically unstable algorithm. If you need numerical stability in calculations, use the stddevPopStable function. It works slower but provides a lower computational error.

Syntax

stddevPop(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 UInt8,
)
ENGINE = Log;

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

SELECT
stddevPop(population) AS stddev
FROM test_data;

Result:

┌────────────stddev─┐
│ 3.794733192202055 │
└───────────────────┘