2.3. Model Training
tumor, AJCC
REGRESSION, TUMOR
We divided the training process into 3 phases: statistical selection, information selection, and model fitting. The statistical selection phase included univariate and multivariate logistic regression analyses of interested variables with regard to in-hospital mortality. The information selection phase considered the variables with mutual information (such as tumor size, T stage, and AJCC stage) and the reliability of the variables (such as race). The final step is to fit the logistic regression model with selected features, using the default optimization algorithm.