Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/8085#discussion_r36811160
--- Diff: docs/sparkr.md ---
@@ -210,6 +210,43 @@ head(df)
{% endhighlight %}
</div>
+### Model Formulae
+
+SparkR allows the fitting of generalized linear models over DataFrames
using the glm() function. Under the hood, SparkR uses MLlib to train a model of
the specified family. In Spark 1.5, we support a subset of the available R
formula operators for model fitting, including '~', '.', '+', and '-'. The
example below shows the use of R formulae with SparkR.
--- End diff --
Done
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