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https://issues.apache.org/jira/browse/MAHOUT-942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399255#comment-13399255
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Sean Owen commented on MAHOUT-942:
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Ikumasa do you have a patch for this?
> Improbe the way to process the missing value for DF.
> ----------------------------------------------------
>
> Key: MAHOUT-942
> URL: https://issues.apache.org/jira/browse/MAHOUT-942
> Project: Mahout
> Issue Type: Improvement
> Components: Classification
> Reporter: Ikumasa Mukai
> Labels: DecisionForest
>
> If we process the data which contains the missing value("?"),
> the tree cannot be created because DataConverter.convert inserts the null
> value
> to the list of Instances.
> Of cause we can fix this issue with prohibiting DataConverter.convert insert
> the null value, but I notice that there is a potentiality that the rows
> which have missing value("?") can be also used to make the tree.
> We can use them for making all stems on the edge where we use the missing
> value.
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