The three categorical variables are specified in the CategoricalColumns argument. The function creates two models, a coefficient table and a linear predictor table, which are output with the names specified in the corresponding arguments.
SELECT * FROM CoxPH ( ON (SELECT 1) PARTITION BY 1 InputTable ('lungcancer') FeatureColumns ('trt', 'celltype', 'karno', 'diagtime', 'age', 'prior') CategoricalColumns ('trt','celltype','prior') TimeIntervalColumn ('time_int') EventColumn ('status') CoefficientTable ('lungcancer_coef') LinearPredictorTable ('lungcancer_lp') );