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of 75 Items with negative values are relatively easy, while items with positive values are relatively dif cult Also included are the standard errors for each item dif culty The precision of the item dif culty estimates varies, which indicates the appropriateness of the item dif culties for the observed abilities in the sample For the 2PL model, both item dif culties and item discriminations vary Low parameters are observed for three items, Item 3, 14, and 15 In a direct sense, the value indicates that item-solving probabilities change relatively more slowly with increased trait level of these items Stated in another way, these items are less discriminating Item dif culties for the 2PL model, , differ somewhat from the estimates in the 1PL due to the varying item discriminations However, the item dif culties have generally the same pattern in the 2PL as in the 1PL model.



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The 3PL model was not estimated for SLAT because the sample size is too small Adequately estimating for the 3PL model requires large samples, such as 1,000 persons if a unique lower asymptote is estimated for each item Measurement Scale Properties Two measurement properties that result from applying IRT models are person-free item calibration and item-free person measurement (see Hambleton, Swaminathan, & Rogers, 1991, for a discussion) Person-free item calibration means that the distribution of persons used to obtain item indices does not bias the indices For CTT, item indices, such as p values, are directly in uenced by the population For example, if a lower-ability population were used to estimate SLAT p values, all values on Table 171 would be lower However, for IRT, comparable estimates for item dif culty can be obtained from the lowest scoring and the highest scoring subpopulations.





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Whitely and Dawis (1974) show how highly similar item dif culties are obtained when the Rasch model estimates are anchored to the item set (ie, item mean is xed to zero) Other indices, such as the biserial correlation, are in uenced by population heterogeneity More homogeneous populations will have lower estimates For IRT, however, item parameters are estimated in the context of person ability estimates That is, a full model of item responses includes abilities and the item parameters Hence, item parameter estimates are controlled for trait level It should be noted, however, that the standard error associated with item parameter estimates is indeed in uenced by the population distribution Higher standard errors will be given for dif cult items, for example, when the population s average trait level is low..

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