Returns the percentage of negative cases correctly classified as negative.
(classify=lambda document:False, documents=[])
| 176 | return recall(classify, document, average=None) |
| 177 | |
| 178 | def specificity(classify=lambda document:False, documents=[]): |
| 179 | """ Returns the percentage of negative cases correctly classified as negative. |
| 180 | """ |
| 181 | TP, TN, FP, FN = confusion_matrix(classify, documents) |
| 182 | return float(TN) / ((TN + FP) or 1) |
| 183 | |
| 184 | TPR = sensitivity # true positive rate |
| 185 | TNR = specificity # true negative rate |
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