Skip Navigation Links
Training Exchange Logo
March 28, 2024
Search
Current Training

By Course Title
By Location
By Date
By Training Partner
By Delivery Method

Course Catalog
By Course Title
By Training Partner
By Delivery Method

Students

View Registrations/Transcripts
Edit Your Profile
Request Training

About Trainex
Overview
Contact Us
Help!

OLEM Training Coordination Team
Locate Team Members
Regional/State Training
Brochure

Other Training Resources
EPA
Other U.S. Government
Non-Detects and Data Analysis
Statistics for Censored Environmental Data
Hosted by U.S. EPA
Region 10

For most environmental professionals, the way to deal with "nondetects" is less than obvious. Values below detection or reporting limits result from measuring trace amounts of a variety of organic and inorganic chemicals. This course presents up-to-date (maximum likelihood and survival analysis) methods for computing summary statistics, hypothesis tests, and regression for data with one or more detection limits. Example problems are worked in class, so students can confidently take these methods back to their office. The course assumes a knowledge of basic statistics, including some familiarity with t-tests, linear regression, and simple nonparametric tests like the rank-sum test.

INSTRUCTOR Dennis Helsel (PhD in Environmental Science and Engineering, Virginia Tech) has 29+ years experience in applying statistical methods to environmental sciences. He has authored articles in numerous journals, including papers on handling nondetect data such as "Less Than Obvious" (ES&T, 1990) and "More Than Obvious” (ES&T 2005). Dr. Helsel has authored Nondetects And Data Analysis (Wiley, 2005), the textbook for this course, as well as Statistical Methods in Water Resources (USGS, 2002). Dr. Helsel is a 2003 recipient of the Distinguished Service Award from the American Statistical Association's section on Statistics and the Environment.

There is no registration fee for this course. For general information contact Diane Ruthruff by telephone at 206-553-5139 (Fax: 206-553-4672) or via e-mail at ruthruff.diane@epa.gov

 Upcoming Events

 No upcoming events.


Previous Events (click to view/hide)
Bullet  Seattle, WA
  July 29, 2008 - July 30, 2008
Logo for USA.gov website