Commonly used uation measures including Recall, Precision, F-Measure and Rand Accuracy are

biased and should not be used without clear understanding of the biases, and corresponding identification of chance

or base case levels of the statistic. Using these measures a system that performs worse in the objective sense of

Informedness, can appear to perform better under any of these commonly used measures- Commonly used　uation measures including Recall, Precision, F-Measure and Rand Accuracy are

biased and should not be used without clear understanding of the biases, and corresponding identification of chance

or base case levels of the statistic. Using these measures a system that performs worse in the objective sense of

Informedness, can appear to perform better under any of these commonly used measures