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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…
Especially in education for adults, there are many subjects that can not be examined with multiple-choice items. Students do something, like write an essay, insert a catheter, build a wall, etc., and experts judge the quality of what they did. Unfortunately, we often see disagreement between the judges. What we Lees meer…
Computer adaptive testing works with a calibrated item bank. Most of us will not be able to afford such luxury. Creating a large calibrated item bank costs a lot of time and money. It is difficult to collect responses under the right (high-stakes) circumstances, and you must trust the item Lees meer…