USGS: Helsel-2005
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Title
| Nondetects and Data Analysis: Statistics for Censored Environmental Data |
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Author
| Helsel, Dennis R. |
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Abstract/Summary Statement
| This book provides solutions for environmental scientists and professionals who need to interpret and analyze data that fall below the laboratory detection limit. Most of the methods come from the field of survival analysis used in medical and industrial research, where the primary variable being investigated is length of time. The author demonstrates their practical applications for studies of trace chemicals in air, water, soils, and biota. Readers quickly become proficient in these methods through the use of real-world examples that are solved using MINITAB® Release 14, a popular statistical software package, as well as other commonly used software packages. |
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Table of Contents
| Chapters: 1. In Focus 2. The Three Approaches 3. Reporting Limits 4. Storing Data in Databases 5. Plotting Data with Non-detects 6. Computing Summary Statistics 7. Computing Interval Estimates 8. What Can Be Done When All Data Are Below the Reporting Limit? 9. Comparing Two Groups 10. Comparing Three or More Groups 11. Correlation 12. Regression and Trends |
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Citation
| Helsel, D.R., 2005, Nondetects and Data Analysis: Statistics for Censored Environmental Data. John Wiley and Sons, Inc: Hoboken, NJ, 250 pp. |
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Method Source
| USGS |
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Source Organization Country
| USA |
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Publication Year
| 2005 |
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Special Notes
| often referred to as the "NADA" statistics book; author published an updated version of the book in 2012 and is affiliated with U.S. Geological Survey |
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Item Type
| Book |
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Publication Source Type
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Other Additional information: Company, Practical Stats, Castle Rock, CO |
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Purpose
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Data analysis |
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Design or Data Analysis Objectives
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Compliance with a threshold Exploring/summarizing data Revisit Temporal trends |
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Complexity
| Medium |
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Media Emphasized
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Air Biological Groundwater Soils/Sediment Surface Water |
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Media Subcategory
| |
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Special Topics
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Handling nondetects |
