What does the ROC curve help determine in model evaluation?1 pointThe relative misclassification cost of the modelThe true-positive rate and false-positive rate for different criteria The optimal model based on diagnostic measuresThe model's statistical significanc

Sensitivity in ROC analysis is defined as:(Here, TP : True Positive, TN: True Negative, FP: False Positive, FN: False Negative) FP/ (FP + TN) FN / (TP + FN) TN/ (TN + FP) TP / (TP + FN)

In ROC analysis, a classifier is called ‘good’ if it has ______ Low TPR and Low FPR Low TPR and High FPR High TPR and Low FPR High TPR and High FPR

(True/False) The shape of ROC curves are the leading indicator of an overfitted logistic regression.1 pointTrueFalse

Which one of the following statements about the receiver operating characteristic (ROC) is FALSE?Group of answer choicesThe TPR is a non-decreasing function of the FPR, i.e. the ROC has a non-negative gradient everywhere. To obtain a smooth ROC, we typically need to average the ROC obtained in multiple rounds of cross-validation.The AUC (Area Under the Curve) is never equal to one under any circumstances.To plot the ROC in a (0,1) classification problem, we can use the "roc_curve" function as follows:from sklearn import metricsimport matplotlib.pyplot as pltfpr, tpr, threshold = metrics.roc_curve(y,scores)plt.plot(fpr,tpr)When FPR = 0, TPR must be 0. When FPR = 1, TPR must be 1.

You are evaluating a binary classifier. There are 50 positive outcomes in the test data, and 100 observations. Using a 50% threshold, the classifier predicts 40 positive outcomes, of which 10 are incorrect.Increasing the threshold to 60% results in 5 additional positive predictions, all of which are correct. Which of the following statements about this new model (compared with the original model that had a 50% threshold) is TRUE?0 / 1 pointThe F1 score of the classifier would decrease.The area under the ROC curve would decrease.The F1 score of the classifier would remain the same.The area under the ROC curve would remain the same.