Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/2123#discussion_r16695695
--- Diff: docs/mllib-stats.md ---
@@ -99,69 +99,336 @@ v = u.map(lambda x: 1.0 + 2.0 * x)
</div>
-## Stratified Sampling
+## Correlation Calculation
+
+Calculating the correlation between two series of data is a common
operation in Statistics. In MLlib
+we provide the flexibility to calculate correlation between many series.
The supported correlation
--- End diff --
`calculate correlation between` -> `calculate pairwise correlations among`
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