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Exercise

Calibration curves

You now know that the gradient boosted tree clf_gbt has the best overall performance. You need to check the calibration of the two models to see how stable the default prediction performance is across probabilities. You can use a chart of each model's calibration to check this by calling the calibration_curve() function.

Calibration curves can require many lines of code in python, so you will go through each step slowly to add the different components.

The two sets of predictions clf_logistic_preds and clf_gbt_preds have already been loaded into the workspace. Also, the output from calibration_curve() for each model has been loaded as: frac_of_pos_lr, mean_pred_val_lr, frac_of_pos_gbt, and mean_pred_val_gbt.

Instructions 1/3

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  • Create a calibration curve plot() by starting with the perfect calibration guideline and label it 'Perfectly calibrated'. Then add the labels for the y-axis and x-axis in order.