1. Introduction
2. Summary of Companion Surveys and Data Sets
2.1. Surveys and Detections
2.2. Window Functions and Bias Correction
3. Models of the Substellar Companion Distribution
3.1. Separation Distribution
3.2. Mass Ratio Distribution
4. Bayesian Analysis
4.1. Bayesian Core Algorithm
4.2. Basic Problem and Setup
5. Results
6. Discussion and Conclusions