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1.3 KiB
slug | sidebar_position |
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/en/sql-reference/aggregate-functions/reference/stddevpop | 188 |
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 │
└───────────────────┘