seawaveQ: an R package providing a model and utilities for analyzing trends in chemical concentrations in streams with a seasonal wave (seawave) and adjustment for streamflow (Q) and other ancillary variables
Open-File Report
2013-1255
National Water-Quality Assessment Program
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Abstract
The seawaveQ R package fits a parametric regression model (seawaveQ) to pesticide concentration data from streamwater samples to assess variability and trends. The model incorporates the strong seasonality and high degree of censoring common in pesticide data and users can incorporate numerous ancillary variables, such as streamflow anomalies. The model is fitted to pesticide data using maximum likelihood methods for censored data and is robust in terms of pesticide, stream location, and degree of censoring of the concentration data. This R package standardizes this methodology for trend analysis, documents the code, and provides help and tutorial information, as well as providing additional utility functions for plotting pesticide and other chemical concentration data.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | seawaveQ: an R package providing a model and utilities for analyzing trends in chemical concentrations in streams with a seasonal wave (seawave) and adjustment for streamflow (Q) and other ancillary variables |
| Series title | Open-File Report |
| Series number | 2013-1255 |
| DOI | 10.3133/ofr20131255 |
| Year Published | 2013 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | North Dakota Water Science Center, Dakota Water Science Center |
| Description | Report: iv, 13 p.; Downloads Directory |
| Online Only (Y/N) | Y |
| Google Analytic Metrics | Metrics page |