Introduction | Background and Motivation | Installation and Loading | Basic Usage | Understanding the Test Statistic | Comparing with Different Group Numbers | Comparison with Hosmer-Lemeshow Test | New in 2.0.0: Directed test, ensemble, and the full battery | Powerful, but not liberal | Power Analysis Example | Handling Grouped Data (Original Farrington Test) | Practical Guidelines | When to Use Each Test Mode | Choosing the Number of Groups | Interpreting Results | Advantages over Hosmer-Lemeshow Test | Limitations and Considerations | References