Presentation on theme: "Claire Ferguson 1, Adrian Bowman 1, Marian Scott 1 and Laurence Carvalho 2 1 University of Glasgow 2 Centre for Ecology & Hydrology A Case Study of Loch."— Presentation transcript:
Claire Ferguson 1, Adrian Bowman 1, Marian Scott 1 and Laurence Carvalho 2 1 University of Glasgow 2 Centre for Ecology & Hydrology A Case Study of Loch Leven Regression Case Study Additive and Varying-Coefficient Models
Dataset: variables measured, covering… Physics Lake chemistry Lake biology Weather Loch Leven (LL)
Loch Leven – The Data
The EC Water Framework Directive (WFD) 2000 states that there should be good status in all shallow waters by Research: Investigating statistical techniques to explore the combined impacts of climate and nutrients on water quality. Motivation
chlorophyll a Response year, month, SRP, Daphnia, water temp, NO 3 -N Covariates Additive Model
Mainly linear relationships between variables. Little evidence of trend and seasonality. Important ecological relationships identified. The nature of trends and relationships can be explored simultaneously. For chlorophyll a (in this time period)- Summary of Additive Models
Linear Regression Model Varying-coefficient Model (VCM) Varying-coefficient Model m = month Do relationships change throughout the year?