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Practical Stats News Archive
We publishedt a
free
newsletter approx 5 times per year for over 15 years. They are listed below in our Archive, and can be listed by topic (click on the topic buttons) for easier access.
Online at:
All (by date)
App Env Stats
Multivariate
Time Series
Perm Tests
Nondetects
Site Investigations/ Software
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Click on the newsletter title to download
April 2017
What’s the difference between Permutation Tests and Bootstrapping?
Jan 2017
Small datasets Part 2: Computing the UCL95
Oct 2016
Small datasets Part 1: Tips for analysis
July 2016
Nonparametric 2-way ANOVA: the BDM test
May 2016
crplots: a tool to decide whether to transform regression predictors
Mar 2016
Seven perilous errors in environmental statistics
Nov 2015
Statistics for doubly-censored data
Sept 2015
Tests for Equal Variance
July 2015
Parametric vs Nonparametric vs Permutation Tests
May 2015
The power of permutation tests
Mar 2015
R
Studio
Jan 2015
Software for trend analysis
Aug 2014
Testing fit to a distribution
May 2014
The meaning of a mean
Mar 2014
Top 12 Tips for Environmental Statistics
Jan 2014
Stats for remarked (between DL and QL) data
Nov 2013
Bootstrapping regression equations
Sept 2013
Low-cost statistics software
Sept 2013
Detailed info for statistics software
review
July 2013
Time series methods for ‘real time’ data
May 2013
Most important variables in a multivariate pattern of chemicals or bio community structure
Mar 2013
The many faces of cluster analysis
Jan 2013
Plotting data with nondetects
Nov 2012
Never delete the intercept in regression
Jul 2012
The UCL95 for data with nondetects
Apr 2012
AIC: Measure of quality for regression and other models
Dec 2011
Serial correlation adjustment for the Mann-Kendall test for trend
Oct 2011
Urban legends in environmental statistics
Aug 2011
Multivariate trend tests with nondetects
Jun 2011
Multivariate methods for data with nondetects
Apr 2011
Things people do with nondetects that are just wrong!
Mar 2011
Methods for interval-censored (0 to the DL) data
Jan 2011
Improvements in software for data with nondetects
Oct 2010
Regression isn’t designed to give the ‘intrinsic’ slope of the x-y relationship
Aug 2010
Popularity of Statistical Software (2010)
July 2010
A modern flowchart to decide which test to use
May 2010
Simple methods for data with nondetects
Mar 2010
Regression for data with nondetects
Jan 2010
Software that makes R easy to use
Dec 2009
Nondetects in fields outside of environmental science - what it can tell us
Oct 2009
Is Excel an adequate statistics package?
Sept 2009
A comparison of Spearman’s and Kendall’s correlation coefficients
Jun 2009
Ggobi: Multivariate visualization
Apr 2009
The modified sign test for data with nondetects or zeros
Feb 2009
Principal components vs Factor analysis vs Regression: How they differ
Jan 2009
Effects of serial correlation on environmental statistics
Jun 2008
Logistic regression — a versatile methods for nondetects, multivariate data, and more
Apr 2008
Sample size calculations for nonparametric tests
Jan 2008
Permutation tests — never worry about a normal distribution again!
Jul 2007
Kaplan-Meier method for nondetects, in Excel
Apr 2007
NMDS: Multivariate graphs of group data
Jan 2007
Equivalence tests for environmental decisions
Jun 2006
Free software: R, and (for nondetects) NADA for R
Feb 2006
The Quantile test
Sept 2005
Hypothesis tests for data with nondetects
June 2005
Tests of normality for data with nondetects
Mar 2005
Tests for paired observations — a good experimental design
Jan 2005
Aitchison’s DLOG method — its just substitution
Oct 2004
Storing nondetects in databases
Jul 2004
Insider censoring — bias when computing statistics for nondetects
Apr 2004
Better methods for computing summary statistics of data with nondetects
Feb 2004
Scatterplots for data with nondetects
Nov 2003
Measuring correlation for data with nondetects
Jul 2003
Cohen’s method for data with nondetects — old technology
Jun 2017
Treat outliers like children
Aug 2017
“Normalize” with ratios
Oct 2017
Multivariate Permutation Tests
Dec 2017
Multivariate PermTests 2 — Permanova
Feb 2018
The Importance of Control Sites
Apr 2018
New Methods for Nondetects
Aug 2018
Comparing Data with Nondetects to Standards, Part 1
Oct 2018
Comparing Data with Nondetects to Standards, Part 2
Jan 2019
Q-Q Plots with Nondetects: Why, How and What NOT to do
Mar 2019
Testing Group Differences with Multiple Detection Limits
July 2019
How Multiple Comparison Tests Work
Oct 2019
Bootstrapping
Jan 2020
How Many Observations Do I Need?
Mar 2020
Incorporating Greater Than and Less Than Values In Data Analysis
Apr 2020
Methods in Our Online Nondetects And Data Analysis Course
Jun 2020
How Many Observations are Censored Data Worth?
Aug 2020
NADA2: Everything You Can Do Today With Nondetects
Oct 2020
Multivariate Graphs 1: Principal Components Analysis
Dec 2020
Multivariate Graphs 2: NMDS
Feb 2021
Three Steps to Build Multiple Regression Models
Mar 2021
30 Days Left to Register for NADA and AES Courses
May 2021
Cluster Analysis -- Standard Practices
May 2022
Walking Out the Door
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