A video in which I confess to having had a longstanding misunderstanding about diagnosing learning disorders.

Excel spreadsheet that can apply multiple regression to individuals.

A video in which I confess to having had a longstanding misunderstanding about diagnosing learning disorders.

Excel spreadsheet that can apply multiple regression to individuals.

I am proud to announce the release of my new computer program, *TableMaker for Psychological Evaluation Reports*. It is designed to help providers of psychological assessments organize and present test data in a simple, efficient, and theoretically informed manner. You enter an evaluee’s test scores in an order that is convenient to you and theoretically organized tables are generated in *MS Word* like so:

*TableMaker* is free. For now, unfortunately, it runs on Windows only.

A video tutorial that explores the issue of when large differences in subtest scores within a composite tell us to ignore the composite score (Short answer: Not very often).

A video tutorial on some reasons for within-composite ability score differences.

An exploration of different meanings of the “broad vs. narrow” distinction in hierarchical models of cognitive ability.

Below are pictures of examples of the two kinds of hierarchies.

Differing Levels of Generality

Differing Levels of Abstraction

Here is a video I made about why composite scores are more extreme than the average of two subtest scores. It is a companion to the paper I wrote with Kevin McGrew about the dangers of averaging subtest scores and thinking of them as composite scores.

The Excel spreadsheet I used in the video can be downloaded here.

A video tutorial about why many variables have a normal distribution:

A video tutorial about Expected Value and its relationship with variance:

- Some Rules of Expected Value Computations
- Measuring Variability Using Expected Values
- The Relationship between the Normal Distribution and the Chi Square Distribution
- Raw Moments
- Central Moments
- The 2nd Central Moment (i.e., Variance) in Terms of Raw Moments

A video tutorial about a different of thinking about the meaning of the mean:

In this video, we take a simple question and we make it complicated so that we can make some complicated questions simple.