Classical Test Theory Ctt And Item Response Theory Irt

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Strayer Univeristy

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Running Head: CTT AND IRT FOR MEASUREMENT PRECISION AN ETHICAL ISSUES 1

CTT and IRT for Measurement Precision and Ethical Issues

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CTT AND IRT FOR MEASUREMENT PRECISION AN ETHICAL ISSUES 2

Classical test theory (CTT) is one the oldest and most prominent psychological theories

that predict outcomes of psychological testing particularly difficulty of the items or the ability of

the test-takers. On the other hand, Item response theory (IRT), sometimes known as latent

response theory is a psychological model that tries to provide explanation between latent traits

which are often unobservable attributes as well as their manifestations. For the purpose of

measurement precision, item response theory (IRT) is more superior to classical test theory

(CTT). According to Kohli et al., 2015, IRT has been the primary framework for educational

measurement and psychometric issues. Based on the authors, IRT is more theoretically superior

to the CTT framework particularly within the context of estimating person and item parameters.

Further, the authors argue that person and item statistics based on CTT framework are test and

sample independent respectively (Kohli et al., 2015).

Research indicates that the item statistics resulting from CTT-based models, item

difficulty, and discrimination are dependent on the sample of the respondent that are selected for

the study. Moreover, if the same items are administered to a different sample and item difficulty

and item discrimination indices computed based on CTT framework, then we are likely to record

substantial variation in results based the same selected (Kohli et al., 2015). In other words, in

CTT, there is standardized measure and as such we are likely to experience variation in results

when the same tests are administered to a new set of sample. On the other hand, the item and

person statistics based on IRT are stable and standardized across different samples of items and

persons. The superiority of IRT is based on the ability variable which is considered to be stable

in IRT because it considers item response function as a regression function of the observed tests

scores (Jabrayilov et al., 2016).

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Running Head: CTT AND IRT FOR MEASUREMENT PRECISION AN ETHICAL ISSUES 1 CTT and IRT for Measurement Precision and Ethical Issues Name Instructor Institutional Affiliation Date CTT AND IRT FOR MEASUREMENT PRECISION AN ETHICAL ISSUES 2 Classical test theory (CTT) is one the oldest and most prominent psychological theories that predict outcomes of psychological testing particularly difficulty of the items or the ability of the test-takers. On the other hand, Item response theory (IRT), sometimes known as latent response theory is a psychological model that tries to provide explanation between latent traits which are often unobservable attributes as well as their manifestations. For the purpose of measurement precision, item response theory (IRT) is more superior to classical test theory (CTT). According to Kohli et al., 2015, IRT has been the primary framework for educational measurement and psychometric issues. Based on the authors, IRT is more theoretically superior to the CTT framework particularly within the context of estimating person and item parameters. Further, the authors argue that person and item statistics based on CTT framework are test and sample independent respec ...
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Tags: significance of change measurement precision observed tests scores abilities and disabilities individual abilities