02946nam a22004452u 4500 5460847 BD-DhUL 20161116175509.0 he u||024|||| 080220s1982 xxu ||| bt ||| | eng d ED264268 ERIC ericd eng ericd MvI BD-DhUL mfm Drasgow, Fritz. Application of Unidimensional Item Response Theory Models to Multidimensional Data [microform] / Fritz Drasgow and Charles K. Parsons. [Washington, D.C.] : Distributed by ERIC Clearinghouse, 1982. 16 p. ERIC Note: In: Item Response Theory and Computerized Adaptive Testing Conference Proceedings (Wayzata, MN, July 27-30, 1982) (TM 850 744). ericd The effects of a multidimensional latent trait space on estimation of item and person parameters by the computer program LOGIST are examined. Several item pools were simulated that ranged from truly unidimensional to an inconsequential general latent trait. Item pools with intermediate levels of prepotency of the general latent trait were also constructed. These item pools were used to determine the degree of prepotency that is required by LOGIST in order to recover the general latent trait and not be drawn to a latent trait underlying a cluster of items. The types of multidimensionality studied have several effects on the estimation techniques programmed in LOGIST. Perhaps most important is that as the prepotency of the general factor decreases, LOGIST is gradually drawn to the strongest group factor. Estimates of item difficulty occasionally become excessively large in magnitude when actual data sets are analyzed by LOGIST, although the most recent version has options that may reduce this problem. The results obtained here indicate that this phenomenon may partially be due to multidimensional item pools. However, unidimensional models do provide a good description of multidimensional data sets when the dominant latent trait is sufficiently prepotent. (PN) Researchers. ericd Microfiche. [Washington D.C.]: ERIC Clearinghouse microfiches : positive. Computer Simulation. ericd Computer Software. ericd Difficulty Level. ericd Item Analysis. ericd Item Banks. ericd Latent Trait Theory. ericd Mathematical Models. ericd Maximum Likelihood Statistics. ericd Psychometrics. ericd Test Items. ericd Testing Problems. ericd Parametric Analysis Unidimensional Scaling LOGIST Computer Program Reports, Research. ericd Speeches/Meeting Papers. ericd Parsons, Charles K., author. ddc BK ANL mc 2253 ED264268 77000000269801 124624 124624 0 0 ddc 0 0 NFIC 234496 DUL DUL GEN 2016-11-16 Purchased 306598 2016-11-16 2016-11-16 BK 0 0 ddc 0 0 NFIC 234497 DUL DUL GEN 2016-11-16 Purchased 306597 2016-11-16 2016-11-16 BK 0 0 ddc 0 0 NFIC 234498 DUL DUL GEN 2016-11-16 Purchased 306450 2016-11-16 2016-11-16 BK