01634nas a2200217   4500008004100000245009700041210006900138300001200207490000700219520087500226653002101101653003001122653002501152653002301177653002501200653002801225653002701253100001301280700001501293856010801308       2002                        eng d00aAn EM approach to parameter estimation for the Zinnes and Griggs paired comparison IRT model0 aEM approach to parameter estimation for the Zinnes and Griggs pa  a208-2270 v263 aBorman et al. recently proposed a computer adaptive performance appraisal system called CARS II that utilizes paired comparison judgments of behavioral stimuli. To implement this approach,the paired comparison ideal point model developed by Zinnes and Griggs was selected. In this article,the authors describe item response and information functions for the Zinnes and Griggs model and present procedures for estimating stimulus and person parameters. Monte carlo simulations were conducted to assess the accuracy of the parameter estimation procedures. The results indicated that at least 400 ratees (i.e.,ratings) are required to obtain reasonably accurate estimates of the stimulus parameters and their standard errors. In addition,latent trait estimation improves as test length increases. The implications of these results for test construction are also discussed. 10aAdaptive Testing10aComputer Assisted Testing10aItem Response Theory10aMaximum Likelihood10aPersonnel Evaluation10aStatistical Correlation10aStatistical Estimation1 aStark, S1 aDrasgow, F  uhttp://iacat.org/content/em-approach-parameter-estimation-zinnes-and-griggs-paired-comparison-irt-model01836nas a2200229   4500008004100000245007400041210006900115300001000184490000700194520110700201653002101308653000901329653004801338653001801386653002801404653002401432653001501456100001601471700001701487700001601504856008601520       2001                        eng d00aEvaluation of an MMPI-A short form: Implications for adaptive testing0 aEvaluation of an MMPIA short form Implications for adaptive test  a76-890 v763 aReports some psychometric properties of an MMPI-Adolescent version (MMPI-A; J. N. Butcher et al, 1992) short form based on administration of the 1st 150 items of this test instrument. The authors report results for both the MMPI-A normative sample of 1,620 adolescents (aged 14-18 yrs) and a clinical sample of 565 adolescents (mean age 15.2 yrs) in a variety of treatment settings. The authors summarize results for the MMPI-A basic scales in terms of Pearson product-moment correlations generated between full administration and short-form administration formats and mean T score elevations for the basic scales generated by each approach. In this investigation, the authors also examine single-scale and 2-point congruences found for the MMPI-A basic clinical scales as derived from standard and short-form administrations. The authors present the relative strengths and weaknesses of the MMPI-A short form and discuss the findings in terms of implications for attempts to shorten the item pool through the use of computerized adaptive assessment approaches. (PsycINFO Database Record (c) 2005 APA )10aAdaptive Testing10aMean10aMinnesota Multiphasic Personality Inventory10aPsychometrics10aStatistical Correlation10aStatistical Samples10aTest Forms1 aArcher, R P1 aTirrell, C A1 aElkins, D E  uhttp://iacat.org/content/evaluation-mmpi-short-form-implications-adaptive-testing