Fig. 4From: Development and validation of a nomogram for prediction of cervical lymph node metastasis in middle and lower thoracic esophageal squamous cell carcinomaCalibration curves of the nomogram in the training (A) and validation (B) sets. The x axis represents nomogram prediction. The y axis represents actual probability. The gray line represents a perfect prediction by an ideal model. The solid line represents the bias-corrected performance of the nomogram, where a closer fit to the gray line represents a better predictionBack to article page