Re: How to the corresponding instance of a prediction

> I am doing an experiment with cancer data where I want to evaluate the performance of a model on various stages of cancer that are present in the dataset.
>
> Consequently after crossvalidating I want to go over the predictions and group them by cancer stage so I can calculate various statistics for each cancer stage.
>
>
> However, after I run eval.crossValidateModel() I no longer know which prediction belongs to which Instance in the dataset.
>
> Since Eval.predictions() does not provide any usefull identifiers to match it back to the instances, I originally assumed the prediction would maintain the same order as the instances in the dataset, but this is not correct.
>
> How do I determine which prediction belongs to which records?

You'd want to use an extra attribute with a unique ID.

Have a look at the following wiki entry:
https://waikato.github.io/weka-wiki/instance_id/

Cheers, Peter
-- 
My Open Source Blog - http://open.fracpete.org
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