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008			080220s1982 xxu ||| bt ||| | eng d
037			_aED264268 _bERIC
040			_aericd _beng _cericd _dMvI _dBD-DhUL
091			_amfm
100	1		_aDrasgow, Fritz.
245	1	0	_aApplication of Unidimensional Item Response Theory Models to Multidimensional Data _h[microform] / _cFritz Drasgow and Charles K. Parsons.
260			_a[Washington, D.C.] : _bDistributed by ERIC Clearinghouse, _c1982.
300			_a16 p.
500			_aERIC Note: In: Item Response Theory and Computerized Adaptive Testing Conference Proceedings (Wayzata, MN, July 27-30, 1982) (TM 850 744). _5ericd
520			_aThe 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)
521	8		_aResearchers. _bericd
533			_aMicrofiche. _b[Washington D.C.]: _cERIC Clearinghouse _emicrofiches : positive.
650	1	7	_aComputer Simulation. _2ericd
650	0	7	_aComputer Software. _2ericd
650	0	7	_aDifficulty Level. _2ericd
650	1	7	_aItem Analysis. _2ericd
650	0	7	_aItem Banks. _2ericd
650	1	7	_aLatent Trait Theory. _2ericd
650	1	7	_aMathematical Models. _2ericd
650	0	7	_aMaximum Likelihood Statistics. _2ericd
650	0	7	_aPsychometrics. _2ericd
650	0	7	_aTest Items. _2ericd
650	0	7	_aTesting Problems. _2ericd
653	1		_aParametric Analysis _aUnidimensional Scaling
653	0		_aLOGIST Computer Program
655		7	_aReports, Research. _2ericd
655		7	_aSpeeches/Meeting Papers. _2ericd
700	1		_aParsons, Charles K., _eauthor.
942			_2ddc _cBK
984			_aANL _cmc 2253 ED264268 _d77000000269801
999			_c124624 _d124624