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