The Receiver Operating Characteristic Curve

Receiver operating characteristic (ROC) curve

A receiver operating characteristic (ROC) curve is a graphical representation used in Bayesian network analysis that plots the true positive rate (recall) against the false positive rate at various classification thresholds.

By utilizing ROC curves, we can effectively compare how individual features influence predictive rates, providing valuable insights into the performance of our Bayesian network models.

The area under the curve (AUC) measures the two-dimensional area beneath the ROC curve from an X-Y axis (0,0) to (1,1), indicating the model's overall classification performance. A higher AUC value signifies better performance in distinguishing between positive and negative outcomes.

ROC for the rain model

Let's evaluate the ROC curve of the Bayesian network "rain model", we need to split our data into training and testing sets, and then make predictions using the model. Once we have the predictions and true values, we can compute the ROC curve using the roc_curve function from the sklearn.metrics module.

Here's a code that demonstrates how to do this:

Note that the model has been created for you, and the data was also already split in train and test.