Exploration and Graphics for RivEr Trends 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. The WRTDS modeling method was initially introduced and discussed in Hirsch et al. (2010) , and expanded in Hirsch and De Cicco (2015) . The paper describing the uncertainty and confidence interval calculations is Hirsch et al. (2015) .

EGRETci

This package EGRETci implements a set of approaches to the analysis of uncertainty associated with WRTDS trend analysis as implemented in the EGRET package.

See: https://doi.org/10.1016/j.envsoft.2015.07.017 for more details.

The EGRETci package is designed to carry out three specific types of tasks.

Evaluate a water quality trend over a specific span of years and produce a variety of tabular results. This is done with a short workflow involving the functions: trendSetUp and wBT. The results come in three forms: 1) console output, which shows the bootstrap replicate process as it is underway and the results when it has finished, 2) a text file that shows the results of the bootstrap analysis (a subset of what is included in the console output), and 3) a set of outputs in a named list called eBoot. The contents of eBoot are described below.
Plot histograms of values for the trend magnitudes, expressed in percent change over the specified period, for flow-normalized concentration and flow-normalized flux. This is done with the function plotHistogramTrend. It depends on outputs contained in eBoot. Note that there are a number of custom outputs similar to these histograms that can be developed from the contents of eBoot (for example, what is the likelihood that the flow normalized flux decreased by more than 2000 kg/year over the trend period). Such analyses would require a small amount of script writing by the user.
Plot confidence bands around the computed trends in flow-normalized concentration and flow-normalized flux. This is done using a function called ciCalculations and then, using the output from that function running two functions that produce the confidence band graphics for concentration and flux respectively (plotConcHistBoot, and plotFluxHistBoot).

How to cite EGRETci:

citation(package = "EGRETci")
#> To cite EGRETci in publications, please use:
#> 
#>   Hirsch, R.M., De Cicco, L.A., Archfield, S.A., Murphy, J.C., 2023,
#>   Exploration and Graphics for RivEr Trends (EGRET) Uncertainty and
#>   Confidence Intervals, version 2.0.5, doi:10.5066/P9CC9JEX
#> 
#> A BibTeX entry for LaTeX users is
#> 
#>   @Manual{,
#>     author = {Robert M. Hirsch and Laura A. {De Cicco} and Stacey A. Archfield and Jennifer C. Murphy},
#>     title = {EGRETci},
#>     publisher = {U.S. Geological Survey},
#>     year = {2023},
#>     url = {https://pubs.usgs.gov/tm/04/a10/},
#>   }

Reporting bugs

Please consider reporting bugs and asking questions on the Issues page: https://github.com/DOI-USGS/EGRETci/issues

Code of Conduct

We want to encourage a warm, welcoming, and safe environment for contributing to this project. See the code of conduct for more information.

Disclaimer

This software is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The software has not received final approval by the U.S. Geological Survey (USGS). No warranty, expressed or implied, is made by the USGS or the U.S. Government as to the functionality of the software and related material nor shall the fact of release constitute any such warranty. The software is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the software.