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terkkila / rf-ace

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Implement new data type: ordinal #44

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
In most RF implementations, "ordinal" as feature type isn't supported, yet in 
many cases such data type is the most natural one. The good news is, ordinal 
feature type can be accounted for with very little modifications:

1. If ordinal feature splits, it is treated as numerical feature
   - IF encoded in a certain way
2. If ordinal feature is splitted, it is treated as categorical feature
   - no need to pay attention to internal formatting

Thus, an ordinal feature has the dual property of being both numerical and 
categorical at the same time. The proposed annotation for ordinal feature is 
naturally "O", e.g.

O:ordinal_feature

as per AFM notation. One problem arises: should the ARFF standard be extended 
to account for ordinal features?

Original issue reported on code.google.com by timo.erk...@gmail.com on 27 Aug 2012 at 2:10

GoogleCodeExporter commented 9 years ago 
For now, no ordinal variables will be considered. Removing issue.

Original comment by timo.erk...@gmail.com on 11 Mar 2013 at 4:35