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https://issues.apache.org/jira/browse/SPARK-18710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wayne Zhang reopened SPARK-18710:
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> Add offset to GeneralizedLinearRegression models
> ------------------------------------------------
>
>                 Key: SPARK-18710
>                 URL: https://issues.apache.org/jira/browse/SPARK-18710
>             Project: Spark
>          Issue Type: New Feature
>          Components: ML
>    Affects Versions: 2.0.2
>            Reporter: Wayne Zhang
>            Assignee: Wayne Zhang
>              Labels: features
>   Original Estimate: 10h
>  Remaining Estimate: 10h
>
> The current GeneralizedLinearRegression model does not support offset. The 
> offset can be useful to take into account exposure, or for testing 
> incremental effect of new variables. It is possible to use weights in current 
> environment to achieve the same effect of specifying offset for certain 
> models, e.g., Poisson & Binomial with log offset, it is desirable to have the 
> offset option to work with more general cases, e.g., negative offset or 
> offset that is hard to specify using weights (e.g., offset to the probability 
> rather than odds in logistic regression).
> Effort would involve:
> * update regression class to support offsetCol
> * update IWLS to take into account of offset
> * add test case for offset
> I can start working on this if the community approves this feature. 
>  



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