Jason T. Newsom PhD

Professor, Department of Psychology, Portland State University





Main Page


Current Courses

Univariate Quant

Multivariate Quant

Categorical Data Analysis

Structural Equation Modeling

Multilevel Regression

Psychological Measurement

Adult Development and Aging


Past Courses

Stats Notes



SEM References

SEM Books




LDA Book

Department of Psychology







Psy 495 Psychological Measurement



Instructions for Assignments

Lab Report Form (.rtf format)

Example Data Sets


Overheads & Handouts

(Only dense slides, graphs, and tables not appearing in the text)

Basic concepts

More basic concepts


Individual differences and correlations

Empirical estimates of reliability

The importance of reliability

Instructions to include with survey

SPSS Reliability Example

Some R Basics for Reliability Analysis

Validity: Conceptual Basis

Validity: Estimating and Evaluating Convergent and Discriminant Validity Evidence

Some Basic Item Analysis for Ability and Knowledge Tests

Testing Bias

Some Basic Item Bias Analyses for Ability and Knowledge Tests

Generalizability Theory

Item Response Theory and Rasch Models

Exploratory and Confirmatory Factor Analysis



Math and Stat Review Articles (.zip)

Statsoft Electronic Textbook

William Trochim's Outstanding Research Methods Knowledge Base

Internet addiction test

Cambridge Psychometrics Centre example personality and IQ tests

Cronbach, L. and Meehl, P. (1955). Construct validity in psychological tests, Psychological Bulletin, 52, 4, 281-302

Yong and Pearce's Beginner's Guide to Factor Analysis

Chong Ho Yu's Simple Guide to IRT

Cronbach's alpha SPSS tutorial

Scale Construction: Developing Reliable and Valid (Hinkin, Tracey, & Enz, 1997)

Editorial: An author's checklist for measure development and validation manuscripts (Holmbeck & Devine, 2009)