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3 edition of Effects of multidimensionality on IRT item characteristics and true score estimates found in the catalog.

Effects of multidimensionality on IRT item characteristics and true score estimates

Xiang Bo Wang

Effects of multidimensionality on IRT item characteristics and true score estimates

implications for computerized test assembly

by Xiang Bo Wang

  • 80 Want to read
  • 17 Currently reading

Published by Law School Admission Council in Newtown, PA .
Written in English

    Subjects:
  • Law School Admission Test -- Statistics,
  • Law schools -- United States -- Entrance examinations -- Statistics,
  • Law schools -- United States -- Admission -- Statistics,
  • Computer adaptive testing,
  • Item response theory

  • Edition Notes

    StatementXiang-Bo Wang, Vincent Harris, Louis Roussos.
    GenreStatistics.
    SeriesLSAC research report series, Law School Admission Council computerized testing report -- 97-06., Computerized testing report (Law School Admission Council) -- 97-06.
    ContributionsHarris, Vincent F., Roussos, Louis A. 1955-, Law School Admission Council.
    Classifications
    LC ClassificationsKF285 .W36 2002
    The Physical Object
    Paginationi, 19 p. :
    Number of Pages19
    ID Numbers
    Open LibraryOL16335113M
    OCLC/WorldCa50439865

    In contrast, simply collapsing item data into a single total score requires item analysis to be disjoint from the evaluation of growth. While one can obtain IRT scores independently of a growth model, those IRT estimates of ability must then be used to estimate growth parameters. One example of this is joint maximum likelihood estimation in IRT where estimates of ability are used to estimate   The use of both c.r. and m.c. item formats in forms equated through common item equating requires determining their presence in anchor item sets. Accepted practice calls for the set of common items to be proportionally representative of the total test forms in content and statistical characteristics (Kolen & Brennan, ).

      Not all test developers match the number of items and/or average item difficulty withi Unidimensional IRT Item Parameter Estimates Across Equivalent Test Forms With Confounding Specifications Within Dimensions - Ki Lynn Matlock, Ronna Turner,   according to their observed correct score and then contingency tables are prepared for each test item. Table 1 shows a contingency table that contains the number of examinees in each group who correctly or incorrectly respond to an item (Clauser and Mazor, ). VarThe null Table 1. Contingency table. Gorup Score on studied item 1 0

      The primary objective was to enhance the content coverage of some of the pediatric self-report item banks for ages years from the National Institutes of Health (NIH) Patient Reported Outcomes Measurement Information System (PROMIS®), and extend the range of precise measurement to higher levels of physical functioning. Data from 1, pediatric patients with cancer, chronic kidney   Because the IRT framework allows one to model the effects of multiple sources of bias, it will be essential to conduct validation studies not only with IRT score estimates and conventional statistical methods, but also using latent variable methods such as multidimensional IRT modeling and IRT modeling for longitudinal ://


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Effects of multidimensionality on IRT item characteristics and true score estimates by Xiang Bo Wang Download PDF EPUB FB2

Multidimensionality is known to affect the accuracy of item parameter and ability estimations, which subsequently influences the computation of item characteristic curves (ICCs) and true scores.

By judiciously combining sections of a Law School Admission Test (LSAT), 11 sections of varying degrees of uni- and multidimensional structures are used to assess the impact of multidimensionality on ?id=ED Get this from a library.

Effects of multidimensionality on IRT item characteristics and true score estimates: implications for computerized test assembly. [Xiang Bo Wang; Vincent F Harris; Louis A Roussos; Law School Admission Council.]   TITLE Effects of Multidimensionality on IRT Item Characteristics.

and True Score Estimates: Implications for Computerized Test Assembly. Computerized Testing Report. LSAC Research Report. Series. INSTITUTION Law School Admission Council, Newtown, PA.

REPORT NO LSAC-R PUB DATE NOTE :// The effects of calibration homogeneity on ability parameter estimates and discrimination parameter estimates are consistent with the existence of two highly correlated verbal dimensions. IRT equating results indicate that although violations of unidimensionality may have an impact on equating, the effect may not be :// IRT and conventional item difficulty parameter estimates for the common items across the two forms were compared for each of the two form/sample combinations.

In addition, conventional and IRT score equatings were performed between the new and old forms for each o f the form sample :// The effects of homogeneity of item calibration pool on estimates of item discrimination were also examined. investigated the effect of multidimensionality on IRT true-score equating.

Through   Table effect of both sample size and test length on item parameter estimation under unidimensional and multidimensional IRT models Unidimensional Multidimensional N=/k=12 N=/k=24 N=/k=12 N=/k=24 SSR 0, 0, 0, 0, RMSR 0,01 0,01 0, 0, Tanaka 0, 0,97 0,97 0, As seen from table 1.

under unidimensional IRT   An examination of the characteristics of unidimensional IRT parameter estimates derived from twodimensional data.

The effect of multidimensionality on IRT true-score equating for subgroups of examinees. Robustness of item response models and effects of test length and sample size on the precision of ability :// Dorans used IRT to study the effects of item deletion on equating functions and the score distribution on the SAT, concluding that reequating should be done when an item is dropped.

Kingston and Holland () compared equating errors using IRT and several other equating methods, and several equating designs, for equating the GRE General Test   To construct cross-walk tables for IRT-based links, we used the item parameter estimates derived from the fixed-parameter calibrations.

28, 29 Tables 3,4, 4,5 5 and and6 6 show four cross-walk tables that associate VR component scores with PROMIS Global Health scores. For both mental and physical health, we provide a summed VR and an   multidimensionality of the item pool.

The Unidimensional Case In the unidimensional case, assume that the item pool fits say, the 3-PL IRT model, P(Y=1 |0,fl,f7,c). A passing score is established by using some subset of the item pool called a standard reference set.

The standard reference set of m items within the item pool Effects of Local Item Dependence on the Validity of IRT Item, Test, and Ability Statistics polytomous IRT model to score testlets, In addition to coefficient α reliability estimates, IRT   IRT is another common theory of test construction and performance.

It relates characteristics of items (item difficulty) and characteristics of individuals (ability) to the probability of a correct item response. Item Response Theory comes in three forms reflecting the number of A Review of the Effects on IRT Item Parameter Estimates with a Focus on Misbehaving Common Items in Test Equating Article (PDF Available) in Frontiers in Psychology October with For each study condition, two traditional equating methods, frequency estimation and chained equipercentile equating, and two item response theory (IRT) equating methods, IRT true score and IRT The advantages of IRT have been described in a number of papers and book chapters: continuous, interval-level scoring, item-level parameters that facilitate the development of valid measures, precise scoring and reliability estimates, and valid comparisons of respondents who took more, fewer, or different items (DeVillis, ; Embretson ().

A comparative study of the effects of recency of instruction on the stability of IRT and conventional item parameter estimates. A Comparison Among IRT Equating Methods and Traditional Equating Methods for Mixed-format Tests. In (). true-score equating results. Most studies examining this issue concluded that (unidimensional) IRT true-score equating procedures were quite robust to departures from the assumption of unidimensionality.

The effects of multidimensionality on the quality of IRT true-score equating results were found to be negligible (Bogan & Yen,   Total score X + is an estimate of a patient’s true score T; this is the expectation of X + across independent replications of the measurement procedure (, pp.

29–30). IRT models distinguish observable or manifest variables such as item score X j and total score X + from latent variables. These latent variables play the role of summaries of Abstract.

In this chapter, we describe item response theory (IRT) equating methods under various designs. This chapter covers issues that include scaling person and item parameters, IRT true and observed score equating methods, equating using item pools, and equating using polytomous IRT. Wingersky, Cook, and Eignor () systematically investigated the effects on IRT true-score equating results of a variety of characteristics of the linking items.

The study was carried out using the three-parameter logistic item response theory model and Monte Carlo ://Aggregate score visual predictive check (VPC) for the rheumatoid arthritis score showing the median, th, and th percentile of the observations together with the corresponding confidence intervals from the model (a) and item‐level VPC for two of the rheumatoid arthritis score items (b), both based on the “true” analysis ://where h = 1, 2,H, and a jh are the item discrimination parameters on the hth dimension of item j.

D was set to 1. Similar to the unidimensional case, P j 0 * (θ) ≡ 1 and P j (K + 1) * (θ) ≡ 0. Manipulated Variables. Previous research (e.g., Reise and Yu, ) has investigated the effects of sample size and test length for the unidimensional the multidimensional case, the