Question 3Which tool is most appropriate for measuring the performance of a classifier on unbalanced classes? 1 pointThe precision-recall curve.The true positive rate.The Receiver Operating Characteristic (ROC) curve. The false positive rate.
Question
Question 3Which tool is most appropriate for measuring the performance of a classifier on unbalanced classes? 1 pointThe precision-recall curve.The true positive rate.The Receiver Operating Characteristic (ROC) curve. The false positive rate.
Solution
The most appropriate tool for measuring the performance of a classifier on unbalanced classes is the Precision-Recall curve.
Here's why:
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Precision-Recall curve: This tool is particularly useful when classes are imbalanced. In such cases, accuracy can be misleading. Precision-Recall gives a more informative picture of an algorithm's performance. Precision (also called Positive Predictive Value) is the fraction of relevant instances among the retrieved instances, while Recall (also known as Sensitivity) is the fraction of the total amount of relevant instances that were actually retrieved.
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True Positive Rate: This is also known as sensitivity, recall or probability of detection in machine learning. It measures the proportion of actual positives that are correctly identified. However, it does not take into account the false positive rate which is crucial in imbalanced classes.
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Receiver Operating Characteristic (ROC) curve: This is a plot that illustrates the diagnostic ability of a binary classifier system as its discrimination threshold is varied. However, ROC curves can present an overly optimistic view of an algorithm's performance if there is a large skew in the class distribution.
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False Positive Rate: This is the probability that a negative example is incorrectly classified as positive. It is equal to one minus the true negative rate. It is not the most appropriate tool for measuring the performance of a classifier on unbalanced classes because it does not consider true positives.
So, the Precision-Recall curve is the most appropriate tool for this task.
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