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latest blog posts

Regression Models: How do you know you need a polynomial term?

November 18, 2024 • Karen Grace-Martin

You might be surprised to hear that not only can linear regression fit lines between a response variable Y and one or more predictor variables, X, it can fit curves too. There are many ways to do this, but the simplest is by adding a polynomial term. So what is a polynomial term and how […] Read More

When to Report Separate Group or a Pooled Mean

November 12, 2024 • guest contributer

Have you ever wondered whether you should report separate means for different groups or a pooled mean from the entire sample? This is a common scenario that comes up, for instance in deciding whether to separate by sex, region, observed treatment, et cetera. Read More

Member Training: Introduction to Item Response Theory and Rasch Models

November 1, 2024 • TAF Support

Item Response Theory (IRT) refers to a family of statistical models for evaluating the design and scoring of psychometric tests, assessments and surveys. It is used on assessments in psychology, psychometrics, education, health studies, marketing, economics and social sciences — assessments that involve categorical items (e.g., Likert items). Read More

stat skill-building compass

Find clarity on your statistics journey. Try the new tool Stat Skill-Building Compass: Find Your Starting Point!