[jira] [Created] (SPARK-18569) Support R formula arithmetic

["Felix Cheung (JIRA)" <ji...@apache.org>]

Felix Cheung created SPARK-18569:
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             Summary: Support R formula arithmetic 
                 Key: SPARK-18569
                 URL: https://issues.apache.org/jira/browse/SPARK-18569
             Project: Spark
          Issue Type: Sub-task
            Reporter: Felix Cheung


I think we should support arithmetic which makes it a lot more convenient to build model. Something like

  log(y) ~ a + log(x)

And to avoid resolution confusions we should support the I() operator:

I
 I(X∗Z) as is: include a new variable consisting of these variables multiplied

Such that this works:

y ~ a + I(b+c), the term b+c is to be interpreted as the sum of b and c.




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