The goal of the code in this repository to provide functions that can be used to screen candidate metrics and perform best subsets analysis to evaluate various combinations of metrics for use in a multimetric index (MMI). There are examples that can be used to see how to call the functions.

To use the code in this repository, there are a few key folders to use. The R folder contains the code for the various functions. Opening these files allows the user to update or alter the code for their own purposes. The html folder contains the help file for each function, whereas the man folder contains the markdown file used to create the .html files. The code and data used to run examples are contained in the examples folder.

To run the examples without having to alter the code, use the .Rproj file to open as a project in R. That will allow the code using the here::here() function to locate data files.

The United States Environmental Protection Agency (EPA) R package code is provided on an “as is” basis and the user assumes responsibility for its use. EPA has relinquished control of the information and no longer has responsibility to protect the integrity , confidentiality, or availability of the information. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by EPA. The EPA seal and logo shall not be used in any manner to imply endorsement of any commercial product or activity by EPA or the United States Government.