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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