Do test takers differ in ability?

Psychometrics deals with individual differences. Can we test whether test takers differ in ability to begin with? The open-source software package dexter, that we developed with two friends at Cito, has a function called ๐ข๐ง๐๐ข๐ฏ๐ข๐๐ฎ๐š๐ฅ_๐๐ข๐Ÿ๐Ÿ๐ž๐ซ๐ž๐ง๐œ๐ž๐ฌ that allows you to do precisely this. If no differences in ability are found, observed Lees meer…

Great synthesis

The great synthesis of the statistical sciences The statistical sciences are somewhat of an archipelago with islands slowly drifting apart over time. For a long time, Psychometrics has been an island at the fringes of the archipelago until, about a decade ago, a bridge was constructedย between psychometrics and statistical physics. Lees meer…