Weka instance weights


Would it be possible to add a column select in the Weka classifier dialog to select a double column containing instance weights (optional)? 

A number of the Weka classifiers can take advantage of instance weights in the learning: http://weka.sourceforge.net/doc.dev/weka/core/WeightedInstancesHandler.html. 

This is particularly useful when dealing with class imbalance and I've succesfully used the following equation for generating instance weights:

Weight(instance) = size of minority class / size of instance class

Where the minority class will get a weight of 1 and all other (larger) classes will have a weight less than 1. 



I'd like to see that as well. As my other replies this week suggest, Weka seems underexploited in its current implementation.


Agree. This would be helpful.