You are viewing a plain text version of this content. The canonical link for it is here.

Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/09/26 07:37:44 UTC

[GitHub] [arrow] jorisvandenbossche commented on pull request #8269: ARROW-10070: [C++][Compute] Implement stdev aggregate kernel

jorisvandenbossche commented on pull request #8269:
URL: https://github.com/apache/arrow/pull/8269#issuecomment-699450469


   We might want to have an option to specify the denominator? (whether it is `n` or `n - 1`, to compute population vs sample standard deviation) As some examples, [numpy](https://numpy.org/doc/stable/reference/generated/numpy.std.html) has a `ddof` keyword, [postgres](https://www.postgresql.org/docs/9.1/functions-aggregate.html) or [clickhouse](https://clickhouse.tech/docs/en/sql-reference/aggregate-functions/reference/stddevpop/) have separate functions for both, [julia](https://docs.julialang.org/en/v1/stdlib/Statistics/#Statistics.std) has a `corrected` keyword.


----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org