Performing the Kernel Method of Test Equating with the Package kequate
2013 (English)In: Journal of Statistical Software, ISSN 1548-7660, Vol. 55, no 6, 1-25 p.Article in journal (Refereed) Published
In standardized testing it is important to equate tests in order to ensure that the test takers, regardless of the test version given, obtain a fair test. Recently, the kernel method of test equating, which is a conjoint framework of test equating, has gained popularity. The kernel method of test equating includes five steps: (1) pre-smoothing, (2) estimation of the score probabilities, (3) continuization, (4) equating, and (5) computing the standard error of equating and the standard error of equating difference. Here, an implementation has been made for six different equating designs: equivalent groups, single group, counterbalanced, non-equivalent groups with anchor test using either chain equating or post-stratification equating, and non-equivalent groups using covariates. An R package for the kernel method of test equating called kequate is presented. Included in the package are also diagnostic tools aiding in the search for a proper log-linear model in the pre-smoothing step for use in conjunction with the R function glm.
Place, publisher, year, edition, pages
American Statistical Association , 2013. Vol. 55, no 6, 1-25 p.
observed-score test equating, R package, kernel equating, item-response theory
Probability Theory and Statistics
Research subject Statistics
IdentifiersURN: urn:nbn:se:uu:diva-208912ISI: 000325948000001OAI: oai:DiVA.org:uu-208912DiVA: diva2:658862