Nominal to Numeric

[neha.bologna]

Hi

I have a dataset which has output variables True or False.. How can I convert it to numeric such that I get RMSE values rather than Accuracy or AUC.

Kind regards

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[Peter Reutemann]

> I have a dataset which has output variables True or False.. How can I convert it to numeric such that I get RMSE values rather than Accuracy or AUC.

RMSE (root mean squared error) is calculated for classification as well.

Converting T/F to 1/0 (or something like that) changes the discrete
classes to a continuous regression problem and interpreting
predictions (-0.1? 9.1? 0.3? 0.51?) may become a problem.

In terms of your query: You could just use a text editor to replace
the strings. Otherwise, use the RenameNominalValues filter and then
change the attribute type in the ARFF file header to "numeric" (using
a text editor).

Cheers, Peter
--
Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
[phone]
http://www.cms.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/
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