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Posted to user@spark.apache.org by Arunkumar Pillai <ar...@gmail.com> on 2016/02/04 12:21:51 UTC

[Spark 1.6] Mismatch in kurtosis values

Hi

I have observed that kurtosis values coming from apache spark has a
difference of 3.

The value coming from excel and in R as same values(11.333)  but the
kurtosis value coming from spark1.6 differs by 3 (8.333).

Please let me know if I'm doing something wrong.

I'm executing via sqlcontext.sql("select kurtosis(columnname) from
tablename)

-- 
Thanks and Regards
        Arun

Re: [Spark 1.6] Mismatch in kurtosis values

Posted by Sean Owen <so...@cloudera.com>.

It's returning excess kurtosis and not the fourth moment, strictly
speaking. I don't have docs in front of me to check but if that's not
documented it should be.

On Thu, Feb 4, 2016, 15:22 Arunkumar Pillai <ar...@gmail.com> wrote:

> Hi
>
> I have observed that kurtosis values coming from apache spark has a
> difference of 3.
>
> The value coming from excel and in R as same values(11.333)  but the
> kurtosis value coming from spark1.6 differs by 3 (8.333).
>
> Please let me know if I'm doing something wrong.
>
> I'm executing via sqlcontext.sql("select kurtosis(columnname) from
> tablename)
>
> --
> Thanks and Regards
>         Arun
>