Practical Stats Training

Online courses in environmental statistics, at your desk.

1. Nondetects And Data Analysis
Register for a FREE course on statistical methods for data with nondetects (also called "censored data"). Methods to compute means, UCL95s, hypothesis tests, regression, trend analysis and multivariate stats (PCA, cluster analysis, etc.), all without substituting one-half the DL for nondetects. The NADA course ia based on the textbook Helsel, D.R. (2012) Statistics for censored environmental data using Minitab and R (2nd edition), written by the instructor.
SCED Register for the free online course, now available on our NADA course page.

Reviews of the First Edition:
"Sound methods......a practical guide" SETAC Globe, March 2005
"I would recommend this book for anyone conducting or reviewing the analysis and reporting of environmental data..." Technometrics, February 2006
"..clear explanations...good instructions...solid advice...This is the book I will share with consulting clients who have data with below detection limit values." Journal of the American Statistical Association, March 2006
"...a 'must-have' desk reference for environmental practitioners dealing with censored datasets." Vadose Zone Journal, February 2006
Reviews on Amazon:
"This book should be owned, and read, by anyone and everyone who ever has to deal with environmental monitoring data." -- Tim Bray
"Excellent Resource" -- Jill Lundell
"Sensible advice...I recently incorporated many of the concepts from this book into regulatory requirements for coastal water quality standards" -- Steve Saiz
"This book fills a huge gap by providing proper statistical methods from the fields of medical and industrial research to the analysis of censored environmental data. ... I have found the information to be extremely helpful in my work as an in-house environmental consultant working for a large manufacturing company." -- Saul Furstein


2. Statistical Methods in Water Resources (2020)
Covers a host of methods in environmental statistics -- confidence, prediction and tolerance intervals; many types of parametric, nonparametric and permutation hypothesis tests; building regression models; trend tests; and more.
The 2020 revision of the classic textbook Statistical Methods in Water Resources is now available as
* a free download. See more details on our Books page
 * an inexpensive hardcopy sold by the US Geological Survey, at https://store.usgs.gov/product/533012



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