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

Soyeon Kim yunni0731 at gmail.com
Fri Apr 15 17:00:35 CEST 2011


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
>y
 [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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