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Posted to issues@spark.apache.org by "Xiangrui Meng (JIRA)" <ji...@apache.org> on 2015/04/29 20:39:07 UTC

[jira] [Created] (SPARK-7240) Covariance for DataFrames

Xiangrui Meng created SPARK-7240:
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             Summary: Covariance for DataFrames
                 Key: SPARK-7240
                 URL: https://issues.apache.org/jira/browse/SPARK-7240
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
            Reporter: Xiangrui Meng
            Assignee: Burak Yavuz


This JIRA is for computing stable covariance between two columns. The method `cov` should live under `df.stat` (similar to `na`).

{code}
df.stat.cov(col1, col2): Double
{code}

Stable algorithm: http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Covariance



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