Title: User's Guide for GcClust—An R Package for Clustering of Regional
Geochemical Data 

By Karl J. Ellefsen and David B. Smith

2016

U.S. Geological Survey Techniques and Methods 7-C13

Book 7. Automated Data Processing and Computations
Section C. Computer Programs 


ABSTRACT:

GcClust is a software package developed by the U.S. Geological Survey
for statistical clustering of regional geochemical data, and similar
data such as regional mineralogical data. Functions within the
software package are written in the R statistical programming
language. These functions, their documentation, and a copy of the
user’s guide are bundled together in R’s unit of sharable code, which
is called a “package.” The user’s guide includes step-by-step
instructions showing how the functions are used to cluster data and
to evaluate the clustering results. These functions are demonstrated
here in this report using test data, which are included in the package.
 
DISCLAIMERS:

This database, identified as TM7c13, has been approved for release 
by the U.S. Geological Survey (USGS).  Although this database has
been subjected to rigorous review and is substantially complete, the
USGS reserves the right to revise the data pursuant to further analysis
and review. Furthermore, it is released on condition that neither the
USGS nor the United States Government may be held liable for any
damages resulting from its authorized or unauthorized use.

Although these data have been processed successfully on a computer
system at the U.S. Geological Survey, no warranty, expressed or implied
is made regarding the display or utility of the data on any other
system, or for general or scientific purposes, nor shall the act of
distribution constitute such warranty.  The USGS or the U.S. Government 
shall not be held liable for improper or incorrect use of the data 
described and/or contained herein.

This software has been approved for release by the U.S. Geological
Survey (USGS). Although the software has been subjected to rigorous
review, the USGS reserves the right to update the software as needed
pursuant to further analysis and review. 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. Furthermore, the software is
released on condition that neither the USGS nor the U.S. Government
shall be held liable for any damages resulting from its authorized
or unauthorized use.

Any use of trade, product or firm names is for descriptive purposes
only and does not imply endorsement by the U.S. Geological Survey.

Although this information product, for the most part, is in the public
domain, it also may contain copyrighted material as noted in the text.
Permission to reproduce copyrighted items for other than personal use
must be secured from the copyright owner.

LIST OF FILES:

00ReadMe.txt
tm7c13.pdf
GcClust_1.0.tar.gz
InstallationInstructions.txt
ProcessScripts.R

  
HOW TO OBTAIN THE DIGITAL FILES:

The digital files constituting the this report can be obtained via the
Internet from the U.S. Geological Survey publications website.
Go to the web page at

http://dx.doi.org/10.3133/tm7c13/ and follow the directions
to download the files.

The report product is a Portable Document Format (.pdf) map,
which requires Adobe Acrobat for viewing. Acrobat software
runs on a variety of systems, and is available for download
free of charge from Adobe at http://www.adobe.com.

Information about the R language can be obtained from 
https://cran.r-project.org/doc/manuals/r-release/R-intro.html.