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For example, standard psychometric formulae such as the Spearman-Brown formula for expressing the reliability of a total score as a function of test length, or Cronbach's alpha lower-bound for reliability are based on elaborations of CTT (see Lord and Novick [1968]).
*In the constrained version of stochastic curtailment, the SD of test length was 3.8 for SC-99.
Through simulations, it was found that CAT can save up to 42% of test length and achieve a very similar degree of measurement precision as NAT.
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The standard deviation of test lengths was 3.8 for the constrained SC-99, as opposed to 3.9 for SC-99.
Covariates included age at time of tests, length of abstinence in days, smoking habits (the total number of cigarettes smoked per day during months of habitual smoking), chemical exposures (mostly organic solvents, adhesives, paints, colors, and powders), body mass index (BMI) at the moment of the study, alcohol use (grams per day), educational level, and employment status.
For the current version of the CAT Fatigue RA, this combination of twenty items in total, two start items and five items per dimension was the most optimal solution in terms of test-length and measurement error for each dimension.
Factors that were not manipulated are sample size, number of clusters, test length, and number of testlets.
The article concludes with a simulation study in which the Bayesian sequential strategy is compared with other procedures that exist for similar classification decision problems in terms of average test length, classification accuracy, and average loss.
Each of the four subscales contains six test items for a total test length of 24 items.
Research shows that without a loss of precision, CATs reduce test length by up to 90%.
The test length of 200 m was taken for the hairiness measurement.
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CEO of Professional Science Editing for Scientists @ prosciediting.com