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When developing a tool for use in research to provide summated ratings, it is important to...

When developing a tool for use in research to provide summated ratings, it is important to decide the type of measurement theory to base the scale on. Classical Test Theory (CTT) and Item Response Theory (IRT) are two different theories. When thinking about research that you could perform why would you opt to use one theory over another?

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Teet theoy is maiily vsed waihin psycho- metnc testing 2 enable us to recognize and ceveloh the eliabity of prycholigial tes

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