Business Survival Analysis Using SAS

Chapter 5: The Cubic Spline Regression and Model Interpretation

Introduction

SAS Enterprise Miner Strategy for Standard Data Format

The Problem: The Nonlinearity of the Hazard Function

The Solution: The Cubic Spline Basis Functions

Two Challenges: Number of Knots to Choose and Placement of the Knots

The Mathematical Definition of a Knot

The Default Five-Knots Cubic Spline Basis Method without Stepwise Selection

The Default Five-Knots Cubic Splines Basis Method Using the Stepwise Selection

Example 1: Interpretation of Numeric Variables

Understanding the Stepwise Regression Spline Model in SAS Enterprise Miner

Writing the Model

Understanding the Odds Ratio

Example 2: Interpretation of Categorical Variables

Odds Calculation of Categorical Variables ...