Welcome to Practical Stats

Statistical training and consulting for the environmental sciences and natural resources. From Singapore to South Dakota, our courses have enabled scientists to build better regression models, test for trends, see multivariate patterns, and correctly interpret nondetect (censored) data.

Our Mission
To train scientists in air, water, soil, and biological sciences to make sense of your data.

Our Next Webinar!
— How Many Observations Do I Need?
Feb 4, 2020 10 am Pacific, 1 pm Eastern.
Webinar Registration link

One of the most common questions I am asked is “How many observations do I need to compute a confidence interval or find a difference in a hypothesis test?” To answer this you'll need to know quite a bit of information first. This webinar will go over what information is needed for two-group parametric and nonparametric hypothesis tests (t-test and Wilcoxon rank-sum test). More information is provided in the new edition of Statistical Methods in Water Resources [link provided when the book is officially published by the US Geological Survey].

Training Courses
We provide online on-demand courses in Environmental Statistics. See our Training Page for course details.

To be notified of our free monthly webinars, sign up on our News page and we'll send you an opt-in link to receive notices. Recordings of past webinars are available on our Online Training Center.
See our Webinars Page for descriptions of available past webinars.

We've provided statistical training for the environmental sciences and natural resources since 1990 in the United States, Europe, Asia and the Middle East. See our credentials page. We clearly communicate information to the working scientist. We make statistics current, accurate, and practical.

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If you send us email requesting an answer, you may receive occasional emails from us announcing information on environmental statistics (no more than 3 per year, usually less). In your Contact Us email you may request that we do not add you to our occasional information list, and your email address will not be saved — but you will not get useful information from us on environmental statistics.

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