Classifier scorer
Pick a scenario, drag the threshold across two overlapping score distributions, and the confusion matrix, accuracy, precision, recall and F1 all update as cases move from one cell to another. The point it makes is the one the exam asks: on an imbalanced problem, accuracy measures the imbalance.
Pick a scenario, drag the threshold across two overlapping score distributions, and the confusion matrix, accuracy, precision, recall and F1 all update as cases move from one cell to another. The point it makes is the one the exam asks: on an imbalanced problem, accuracy measures the imbalance.
Classifier scorer
Move the threshold and watch precision and recall trade against each other. This tool needs JavaScript, so turn it on to use it. Everything you need to answer the exam question is explained in the text above.