[R] prediction error in ROCR package when sampled y consists of only one class

From: Soyeon Kim <yunni0731_at_gmail.com>
Date: Fri, 15 Apr 2011 10:00:35 -0500

Dear R users,

Hi. I am using prediction function in ROCR package. y consists of two classes 0 and 1.
However, since I am using cross-validation, a sampled small number of y may consist of only one class

 [1] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 In this case, prediction function gives an error: Error in prediction(predic, y) : Number of classes is not equal to 2. ROCR currently supports only evaluation of binary classification tasks.

How can I solve this problem?

Thank you,
Soyeon Kim

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