[R] Re: R library(e1071) question: definition of performance in tune.* functions

From: Tae-Hoon Chung <thchung_at_tgen.org>
Date: Wed 14 Jul 2004 - 07:04:19 EST

Thank you David and Andy. Now, everything is clear. For others, the problem is the one said in the subject, and the answer is the one excerpted from reply from David.

On Jul 13, 2004, at 1:54 PM, David Meyer wrote:

> Tae-Hoon:
>> When we run tune.* for parameter tuning, we get performance value.
>> Can you tell me what the definition of it is?
> The values returned by tune() are Mean Squared Errors in case of
> regression, and simple rates (*no* percentages) in case of
> classification. As Andy already suggested, you might want to check if
> your target variable is indeed a factor. In case it is and you still
> get
> values greater than 1, drop me a mail with a piece of code (and data)
> enabling me to reproduce the phenomenon.
> Best,
> David
> --
> Dr. David Meyer
> Department of Information Systems
> Vienna University of Economics and Business Administration
> Augasse 2-6, A-1090 Wien, Austria, Europe
> Fax: +43-1-313 36x746
> Tel: +43-1-313 36x4393
> HP: http://wi.wu-wien.ac.at/Wer_sind_wir/meyer/
Tae-Hoon Chung, Ph.D

Post-doctoral Research Fellow
Molecular Diagnostics and Target Validation Division Translational Genomics Research Institute 1275 W Washington St, Tempe AZ 85281 USA Phone: 602-343-8724

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