Exploration and Graphics for RivEr Trends (EGRET) Confidence Intervals

Collection of functions to evaluate uncertainty of results from water quality analysis using the Weighted Regressions on Time Discharge and Season (WRTDS) method. This package is an add-on to the EGRET package that performs the WRTDS analysis.

A bootstrap method for estimating uncertainty of water quality trends

See: http://authors.elsevier.com/sd/article/S1364815215300220 for more details


This software is in the public domain because it contains materials that originally came from the U.S. Geological Survey (USGS), an agency of the United States Department of Interior. For more information, see the official USGS copyright policy at http://www.usgs.gov/visual-id/credit_usgs.html#copyright

Although this software program has been used by the USGS, no warranty, expressed or implied, is made by the USGS or the U.S. Government as to the accuracy and functioning of the program and related program material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.

This software is provided "AS IS."

Package Installation

To install the EGRETci package you need to be using R 3.0 or greater. Then use the following command:

    install.packages("EGRETci", repos=c("http://owi.usgs.gov/R",

Linux: Build Status



Reference manual

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1.0.2 by Laura DeCicco, 2 years ago


Report a bug at https://github.com/USGS-R/EGRETci/issues

Browse source code at https://github.com/cran/EGRETci

Authors: Robert Hirsch [aut], Laura DeCicco [aut, cre]

Documentation:   PDF Manual  

CC0 license

Imports EGRET, binom, lubridate, stats, graphics

Suggests knitr, testthat, foreach, doParallel, iterators, rmarkdown

See at CRAN