DIMTEST swMATH ID: 33561 Software Authors: William Stout, Ratna Nandakumar et al. Description: Refinements of Stout’s Procedure for Assessing Latent Trait Unidimensionality. This article provides a detailed investigation of Stout’s statistical procedure (the computer program DIMTEST) for testing the hypothesis that an essentially unidimensional latent trait model fits observed binary item response data from a psychological test. One finding was that DIMTEST may fail to perform as desired in the presence of guessing when coupled with many high-discriminating items. A revision of DIMTEST is proposed to overcome this limitation. Also, an automatic approach is devised to determine the size of the assessment subtests. Further, an adjustment is made on the estimated standard error of the statistic on which DIMTEST depends. These three refinements have led to an improved procedure that is shown in simulation studies to adhere closely to the nominal level of signficance while achieving considerably greater power. Finally, DIMTEST is validated on a selection of real data sets Homepage: https://www.jstor.org/stable/1165182?seq=1 Related Software: PARSCALE; BILOG; MSP5; TESTFACT; IRTPRO; SAS; SPSS; AS 136; mokken; Genocop; TESTGRAF; NOHARM; Fahrmeir; bootstrap Cited in: 12 Publications Standard Articles 2 Publications describing the Software, including 2 Publications in zbMATH Year Using resampling methods to produce an improved DIMTEST procedure. Zbl 1021.62099Stout, William; Froelich, Amy Goodwin; Gao, Furong 2001 A nonparametric approach for assessing latent trait unidimensionality. Zbl 0718.62089Stout, William 1987 all top 5 Cited by 14 Authors 4 Stout, William F. 2 Ip, Edward Haksing 2 Sijtsma, Klaas 2 Zhang, Jinming 1 Bouwmeester, Samantha 1 Brusco, Michael J. 1 Froelich, Amy Goodwin 1 Gao, Furong 1 Habing, Brian 1 Price, Larry R. 1 Roussos, Louis A. 1 Steinley, Douglas L. 1 Straat, J. Hendrik 1 van der Ark, L. Andries Cited in 3 Serials 8 Psychometrika 2 Journal of Classification 1 Methodology in the Social Sciences Cited in 2 Fields 12 Statistics (62-XX) 1 Game theory, economics, finance, and other social and behavioral sciences (91-XX) Citations by Year