apoc.coll.stdev

Details
Syntax	`apoc.coll.stdev(list [, isBiasCorrected ])`
Description	Returns sample or population standard deviation with `isBiasCorrected` true or false respectively.
Arguments	Name	Type	Description
	`list`	`LIST<INTEGER \| FLOAT>`	A list to collect the standard deviation from.
	`isBiasCorrected`	`BOOLEAN`	Will perform a sample standard deviation if `isBiasCorrected`, otherwise a population standard deviation is performed. The default is: `true`.
Returns	`INTEGER \| FLOAT`

The functionality of apoc.coll.stdev() is available using Cypher’s stDev() and stDevP() functions.

Usage examples

The following examples compute the standard deviation of values in a list using both APOC and Cypher:

apoc.coll.stdev

WITH [1,2,3,4,5] AS list
RETURN apoc.coll.stdev(list) AS output

Using Cypher’s UNWIND and stDev()

UNWIND [1,2,3,4,5] AS x
RETURN stDev(x) AS output

Results
output
1.5811388300841898

The following examples compute the standard deviation of values over an entire population in a list using both APOC and Cypher:

apoc.coll.stdev

WITH [1,2,3,4,5] AS list
RETURN apoc.coll.stdev(list, false) AS output

Using Cypher’s UNWIND and stDevP()

UNWIND [1,2,3,4,5] AS x
RETURN stDevP(x) AS output

Results
output
1.4142135623730951