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Applied Environmental Statistics 1

Modern methods for Describing Data, Computing Intervals and Testing for Differences

Mean or Median -- what is your objective? Why it makes a difference.

Graphing data for insight.

Transformations - what are they used for and when to use them.

Treat outliers like children -- correct them when needed but never throw them out

Applying confidence, prediction and tolerance intervals to practical problems.

Hypothesis Tests -- how they work. Which types (parametric, nonparametric, permutation) to use?
Testing the mean/median/precision of two groups, more than two groups, matched pairs, and more.

Comparing data to a numerical standard.


Your Instructor


Dennis Helsel
Dennis Helsel

Dennis Helsel (Ph.D. Environmental Science and Engineering) is a consultant and trainer on statistical methods for environmental and natural resource scientists through his firm, Practical Stats. He has authored three textbooks including Statistics for Censored Environmental Data using Minitab and R (2012), which presents methods for handling data below detection/reporting limits. He regularly conducts webinars, seminars and courses on topics such as Urban Legends in Environmental Statistics and Statistics for Contaminated Sites. He worked as a hydrologist, geochemist, and statistician for 30 years at the US Geological Survey before starting Practical Stats. For his training courses in applied statistics within and outside North America he received the Distinguished Achievement Award in 2003 from the American Statistical Association’s Section on Statistics and the Environment.


Class Curriculum


  Download Course Materials and Install Software
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  Section 1. Descriptive Statistics and Graphs
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  Section 2. How Hypothesis Tests Work
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  Section 3. Confidence, Prediction and Tolerance Intervals
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  Section 4. Testing Count Data, Paired Data, and Exceedance of Standards
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  Section 5. Testing Differences in Groups of Data
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  Section 6. Testing Differences in Precision (or Variance)
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"I took the in-person version of this AES (1 and 2) course. It was absolutely excellent. I told my manager that it was the best lecture/workshop that I had ever been to! Of any kind, but especially of stats. Dennis took the time to explain the stats very clearly and identified very important things to consider, especially in terms of water chemistry data. I have always had trouble with trends of concentrations or loads over time because of the variability due to flow. Now I know how to deal with this situation, and will be able to separate natural from possible human-caused changes in water quality. I will be applying these techniques in the future, including multiple regression (while removing the effect of flow) and the Regional Kendall test to see if there is an increasing or decreasing trend watershed-wide. This will enable me to write a paper on trends in water quality in the Lake Simcoe river basin in Ontario." -- Eavan OConnor, Lake Simcoe Region Conservation Authority, Ontario, Canada

Frequently Asked Questions


When does the course start and finish?
The course starts now and never ends! It is a completely self-paced online course - you decide when you start and when you finish.
How long do I have access to the course?
How does lifetime access sound? After enrolling, you have unlimited access to this course for as long as you like - across any and all devices you own.
What if I am unhappy with the course?
We would never want you to be unhappy! If you are unsatisfied with your purchase, contact us in the first 30 days and we will give you a full refund.

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