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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