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. Author manuscript; available in PMC: 2020 Nov 20.
Published in final edited form as: J Thorac Oncol. 2018 Jun 11;13(9):1338–1348. doi: 10.1016/j.jtho.2018.05.037

Figure 2.

Figure 2

Validation of proposed nomogram prognostic model in the testing set. (a) Risk scores of testing set cases were calculated according to the model in Figure 1 and grouped into 8 subgroups. K-M plot was depicted for each group. (b) Summary of groups in (a). Hazard Ratio (HR) was calculated using Coxph regression model between each two adjacent lines. P-value was calculated using Wald test. (c) Area under the curve (AUC) was calculated for three prognostic models for every month from the 1st to the 30th month. Blue: nomogram developed in this study; green: AJCC 8th TNM staging system; red: limited/extensive staging system. (d, e) Calibration curves compare predicted and actual survival proportions at 1 year (d) and 2 years (e), separately. Each point in the plot refers to a group of patients, with the nomogram predicted probability of survival shown on x-axis and actual survival proportion shown on y-axis. Distributions of predicted survival probabilities are plotted at the top. Error bars represent 95% confidence intervals.