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')
);