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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
By:
and
DOI: 10.3133/ofr20131255

Links

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.

Additional Publication Details

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
Description:
Report: iv, 13 p.; Downloads Directory
Number of Pages:
22
Online Only (Y/N):
Y