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NADA for R: Nondetects and Data Analysis for the R statistical computing environment

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Developed by the U.S. Geological Survey, NADA for R is a library package for the R environment for graphics and statistics. All functions are presented within in a consistent, user-friendly framework and can be used to:

  • plot data,
  • generate summary statistics,
  • compute exceedance probabilities, and
  • perform hypothesis tests on data containing multiple censoring thresholds (a.k.a nondetects, or less-thans).
 
The package contains data and analysis methods described in the book: Nondetects and Data Analysis: Statistics for Censored Environmental Data, Helsel (2005). 
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