Practical Stats Newsletter Archive

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Computing the UCL95 for small datasets

Tips for analysis of small data sets, Part 1

Nonparametric test for 2-factor ANOVA

Should I transform one or more X variables in regression?

Seven Perilous Errors in Environmental Statistics

Stats for Doubly-Censored Data

Tests for Equal Variance

Parametric, Nonparametric & Permutation Tests

The Power of Permutation Tests

R Studio as a front end to R statistics software

Software for Trend Analysis

Testing Fit to a Distribution

The Meaning of a Mean, as applied to pH and other log transformations

Top 12 Tips in Environmental Statistics

Stats for Remarked ("J values") Data

Bootstrapping Regression Models: Why and How

Review of lower-cost statistics software

pdf of detailed spreadsheet for Stat Package review

The need for modern time series methods with 'real time' data.

Which variables are most important in determining a multivariate pattern of chemicals or bio community structure?

The many faces of cluster analysis.

Principles for plotting data with nondetects

Should I ever delete (force to be 0) the regression intercept?

The UCL95 for data with nondetects

AIC: quality of regression and other models

ProUCL Unofficial Users Guide

Serial Correlation Adjustment for the Mann-Kendall Test

Urban Legends in Environmental Statistics

Multivariate Trend Tests with Nondetects

Multivariate Methods for Data With Nondetects - a preview of the upcoming 2nd ed. of the textbook on stats for censored data

Things People Do With Nondetects that are Just Wrong!

Interval Censoring - Newer methods for nondetects

Improvements in Software for Nondetects

Regression doesn't mimic a 1:1 line

Popularity of Statistical Software 2010

A modern flowchart for deciding which hypothesis test to use

Simple methods for nondetects, without substitution

Methods for regression with data including nondetects

Software that makes R easy to use.

Nondetects in fields outside of environmental science: what it can tell us

Is Excel an Adequate Statistics Package? An update

A comparison of Spearman's and Kendall's correlation coefficients, with reference to an article by G. Noether

Ggobi: Multivariate visualization

The Sign Test modified for data with many ties, as with zero counts or nondetects

Principal Components vs Factor Analysis vs Multiple Regression: How they differ.

Serial Correlation and its effects on environmental stats

Logistic Regression - A versatile and useful method

Sample size calculations for nonparametric tests

Permutation Tests - Avoiding restrictive test assumptions

The Cost of Statistical Software

Kaplan-Meier with Excel

Nonmetric MultDimensional Scaling is an extremely useful plot for viewing multidimensional patterns.

Equivalence Tests - application to environmental decisions

Free software: R and NADA for R

Free software -- Dataplot

The quantile test, with regulatory applications

Alternatives to regression, and why to use them

Hypothesis tests for censored data

Testing normality for censored data

Pairing observations, a good experimental design

Aitchison's DLOG method -- its just substitution

Storing nondetects in databases

Insider censoring

Better methods for computing summary stats with nondetects

Scatterplots for censored data

Correlation for censored data

Cohen's method for nondetects -- old technology

Why not substitute 1/2 the detection limit?

An Online Statistics Manual