import lifelines data = pd.read_csv('sample.csv') duration = 'DUR' event = 'EVT' formula = 'EXP1 + EXP2 + EXP3' model = lifelines.CoxPHFitter(baseline_estimation_method='breslow') model.fit(data, duration_col=duration, event_col=event, formula=formula, fit_options={'step_size':0.001}, show_progress=True) model.print_summary(decimals=5)