What is the significance of AUC?

The Area Under the Curve (AUC) is the measure of the ability of a classifier to distinguish between classes and is used as a summary of the ROC curve. The higher the AUC, the better the performance of the model at distinguishing between the positive and negative classes.

How do you interpret the area under the ROC curve?

AREA UNDER THE ROC CURVE In general, an AUC of 0.5 suggests no discrimination (i.e., ability to diagnose patients with and without the disease or condition based on the test), 0.7 to 0.8 is considered acceptable, 0.8 to 0.9 is considered excellent, and more than 0.9 is considered outstanding.

What is the range of area under the ROC curve?

The AUC value is within the range [0.5–1.0], where the minimum value represents the performance of a random classifier and the maximum value would correspond to a perfect classifier (e.g., with a classification error rate equivalent to zero).

Is AUC the same as accuracy?

For a given choice of threshold, you can compute accuracy, which is the proportion of true positives and negatives in the whole data set. AUC measures how true positive rate (recall) and false positive rate trade off, so in that sense it is already measuring something else.

What does AUC mean in medical terms?

In pharmacology, the area under the plot of plasma concentration of a drug versus time after dosage (called “area under the curve” or AUC) gives insight into the extent of exposure to a drug and its clearance rate from the body.

What is the meaning of ROC curve?

receiver operating characteristic curve
An ROC curve (receiver operating characteristic curve) is a graph showing the performance of a classification model at all classification thresholds. This curve plots two parameters: True Positive Rate.

What is the maximum value for AUC?

1
The area under the TPR-FPR curve will give an idea about the effectiveness of the model. The higher the AUC score, the better is the model. AUC scores are used to compare different models. The maximum value of AUC can be 1.

Can AUC be greater than accuracy?

Why is AUC higher for a classifier that is less accurate than for one that is more accurate? In terms of accuracy and other measures, A performs comparatively worse than B. However, when I use the R packages ROCR and AUC to perform ROC analysis, it turns out that the AUC for A is higher than the AUC for B.

What is a good PR AUC score?

What is the value of the area under the roc curve (AUC) to conclude that a classifier is excellent? The AUC value lies between 0.5 to 1 where 0.5 denotes a bad classifer and 1 denotes an excellent classifier.

Is ROC AUC better than accuracy?

5. Accuracy vs ROC AUC. The first big difference is that you calculate accuracy on the predicted classes while you calculate ROC AUC on predicted scores. That means if our problem is highly imbalanced we get a really high accuracy score by simply predicting that all observations belong to the majority class.

What is area under the curve statistics?

The area under the curve is an integrated measurement of a measurable effect or phenomenon. It is used as a cumulative measurement of drug effect in pharmacokinetics and as a means to compare peaks in chromatography.

What is the significance level of the ROC curve?

The 95% Confidence Interval is the interval in which the true (population) Area under the ROC curve lies with 95% confidence. The Significance level or P-value is the probability that the observed sample Area under the ROC curve is found when in fact,…

When to use the AUC-ROC curve in machine learning?

In Machine Learning, performance measurement is an essential task. So when it comes to a classification problem, we can count on an AUC – ROC Curve. When we need to check or visualize the performance of the multi-class classification problem, we use the AUC (Area Under The Curve) ROC (Receiver Operating Characteristics) curve.

What’s the area under the T4 ROC curve?

The area under the T4 ROC curve is .86. The T4 would be considered to be “good” at separating hypothyroid from euthyroid patients. ROC curves can also be constructed from clinical prediction rules. The graphs at right come from a study of how clinical findings predict strep throat (Wigton RS, Connor JL, Centor RM.

Where does the ROC curve go in a discrimination model?

A model with high discrimination ability will have high sensitivity and specificity simultaneously, leading to an ROC curve which goes close to the top left corner of the plot. A model with no discrimination ability will have an ROC curve which is the 45 degree diagonal line.