UCM Procedure OverviewGetting StartedSyntaxDetailsExamplesReferences Examples: UCM Procedure Subsections: 30.1 The Airline Series Revisited 30.2 Variable Star Data 30.3 Modeling Long Seasonal Patterns 30.4 Modeling Time-Varying Regression Effects 30.5 Trend Removal Using the Hodrick-Prescott Filter 30.6 Using Splines to Incorporate Nonlinear Effects 30.7 Detection of Level Shift 30.8 ARIMA Modeling 30.9 Extracting a Business Cycle 30.10 A Transfer-Function Model for the Italian Traffic Accident Data Last updated: July 09, 2026