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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 ๐ข๐ง๐๐ข๐ฏ๐ข๐๐ฎ๐๐ฅ_๐๐ข๐๐๐๐ซ๐๐ง๐๐๐ฌ that allows you to do precisely this. If no differences in ability are found, observed Lees meer…