This Second Edition introduces methods for censored data that are directly applicable to air quality, water quality, soil, and contaminants in biota, among other media. Most of the methods come from the field of survival analysis, where the primary variable being investigated is length of time. However, this book applies these methods to environmental measures such as concentration. Nondetects and Data Analysis is primarily intended for environmental scientists who desire better analysis and interpretation of detection limit data. Most methods cited in the book are widely used in medical and industrial settings, but have been rarely or never applied to issues of environmental health, i.e. contamination of ground water, surface water, soils, air quality, fish, and/or other biota. Steps necessary to take these existing procedures, based on survival analysis of right-censored data applied to left-censored environmental data, are fully illustrated. Discussion is kept to the level expected of a practicing scientist, referencing more detailed work while avoiding calculus and most derivations of procedures. Within each chapter, examples have been provided in sufficient detail so that readers may apply these methods to their own work.
