HEC-SSP Tutorials and Guides Partial Duration Series Workshops using R Frequency Analysis Refresher Workshop Current: Task 3. Fit and Compare Multiple Models to the Spring Season 3-day Precipitation Time Series PDF Download PDF Download page Task 3. Fit and Compare Multiple Models to the Spring Season 3-day Precipitation Time Series. Current page All pages Task 3. Fit and Compare Multiple Models to the Spring Season 3-day Precipitation Time Series Use a season spanning 01Apr through 15Jul to filter the data. The Dates and Threshold tab and Peaks tab should appear similar to the figure below.Accept a model and estimate quantile information.The GEV | Linear Moments model was chosen and is shown in the figure below.Continue to Task 4. Fit and Compare Multiple Models to the All Season 3-day Precipitation Time Series. ×