Model Archive - Statistical analysis of the influence of conservation implementation on water quality during surface runoff events at edge-of-field monitoring sites located in the Laurentian Great Lakes Basin, 2012 to 2021

This is an archive of model code used in statistical analysis of the influence of conservation implementation on water quality during surface runoff events at edge-of-field monitoring sites located in the Laurentian Great Lakes Basin, using data collected from 2012 to 2021. The workflow includes two types of analysis: 1) analysis of covariance (ANCOVA) for paired sites and 2) generalized additive models (GAM) for unpaired, before-after sites. Three sets of paired watersheds used a before-after-control-impact study design, where one watershed had conservation implemented after a baseline period. The analysis of covariance (ANCOVA) script produces linear regression models and analysis of variance (ANOVA) tests that compare the relationship between paired observations in the baseline period with the period after implementation. Generalized additive models (GAM) were used at the unpaired sites to determine the influence of conservation implementation on event response variables while accounting for variation contributed by environmental drivers.