AssessingPsyche

A Blog about Psychological Assessment

A normal population curve with a composite IQ of 66 and three individual IQ results of 69, 71, and 73

Composite IQ Calculator: A Free Web App

Assessment
Capital Cases
Death Penalty
IQ
Intelligence Testing

Announcing a new web app that calculates composite IQ from multiple IQ test administrations

Jul 5, 2026
W. Joel Schneider

Horn & Cattell (1966)

A Re-Analysis
Horn & Cattell (1966) was a landmark study in the advancement of intelligence theory. It prompted Cattell to refine his original gf-gc theory, bringing it closer to…
May 18, 2025
W. Joel Schneider
 

Overture Redux

The original title of this blog (Assessing Psyche, Engaging Gauss, Seeking Sophia) was more of an aspiration than a description. To keep things simple, going forward the…
Sep 12, 2023
W. Joel Schneider

A graphical depiction of CHC Theory

The RESCA-E Subtests Are Thoughtfully Designed and Highly Refined Measures of CHC Constructs

A Review of the Receptive, Expressive & Social Communication Assessment–Elementary
Conflict of Interest Statement: ATP Assessments, the publisher of the RESCA-E, commissioned me to write a descriptive account of the likely relations among the RESCA-E…
Oct 26, 2016
W. Joel Schneider

Difference scores, the absolute deviation, and the half-normal distribution

In psychological assessment, sometimes we want to contrast two scores. For example, suppose we give two tests of visual-spatial ability to an individual. On Test A the score…
May 5, 2014
W. Joel Schneider

A Gentle, Non-Technical Introduction to Factor Analysis

statistics

Discovering Underlying Dimensions in Data

Jan 13, 2014
W. Joel Schneider
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