📌 Reliability as a theorem: Reframed not as an assumption of classical test theory, but as a direct consequence of Hilbert space projection geometry; interpret true scores Recently published in 𝘌𝘥𝘶𝘤𝘢𝘵𝘪𝘰𝘯𝘢𝘭 𝘢𝘯𝘥 𝘗𝘴𝘺𝘤𝘩𝘰𝘭𝘰𝘨𝘪𝘤𝘢𝘭 𝘔𝘦𝘢𝘴𝘶𝘳𝘦𝘮𝘦𝘯𝘵, Online first, open access 𝐟𝐮𝐥𝐥 𝐚𝐫𝐭𝐢𝐜𝐥𝐞: doi.org/10.1177/0013...

Last call for papers for the 10th integrated HPS conference: March 27 - March 29, 2025 in Pasadena, California. Please consider submitting and share widely. (Deadline: August 18) #philsky, #philsci, #histsci, #histSTM

A couple of weeks ago I had the pleasure of talking to Carmelina Conterino at the HPS Podcast.

At last week's NCME conference, I did a workshop on Bayesian latent variable modeling with a focus on the blavaan package. We discussed factor analysis, item response models, and two-level structural equation models. Slides and code are at the first bullet:

Sometimes the best way to support academic freedom is to tell those who summon you that they have no jurisdiction

Free webinar for researchers and data analysts conducting survey research. Provides a description and demo of the impact of ignoring survey nonresponses on your conclusions — role of statistical models. YouTube - youtu.be/2jS58Zs7eek (2:07:53 in length); PDF of lecture notes at tinyurl.com/y8zbdv5n

1/2 🧵Regarding the effects of measurement error on regression coefficients, see Figure 2 and the section titled "Errors of Inference Due to Data–Model–Inference Mismatch" in Shear, B. R., & Zumbo, B. D. (2013) doi.org/10.1177/0013...

This insightful article by Brian Haig should go a long way toward clearing the muddy waters surroundiing EFA. Haig B. D. (2005). Exploratory Factor Analysis, Theory Generation, and Scientific Method. Multivariate behavioral research, 40(3), 303–329. doi.org/10.1207/s153...

🧵 1/2 New open access paper: First soup-to-nuts description of my explanation-focused view of test validity. A dialectic on validity: Explanation-focused and the many ways of being human. “International Journal of Assessment Tools in Education,” vol. 10, pp. 1-96. doi.org/10.21449/ija...

I finally took the leap to Bluesky. So far, the interface and system are quite intuitive. Bio: I am mathematical scientist working on topics in education & social sciences. I’ve devoted a large part of my career on developing what I refer to as measure-theoretic (psychometric) test theory. [1/3]