Rasch

What Is Item Response Theory (IRT) And Why Should Researchers Care?

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If you’ve studied statistics in a psychology program, you learned classical test theory, even if nobody called it that. Reliability, Cronbach’s alpha, total scores, item-total correlations: all of it belongs to the classical framework. It’s the water most researchers swim in. But there’s another framework, one that underlies nearly all modern large-scale testing – the … Read more

PsychoMetrika APP – Item Analysis for Teachers and Lecturers, Without the Code

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If you teach, you give tests. Quizzes, midterms, finals, classroom assessments. They’re a core part of how we measure what students have learned. But here’s a question most teachers never ask: how good are your tests, actually? Most assessment in education is built on intuition. A teacher writes questions that seem fair, grades the results, … Read more