The Graphical Display of Simulation Results, with Applications to the Comparison of Robust IRT Estimators of Ability [microform] / David Thissen and Howard Wainer
- Bib ID:
- 5452280
- Format:
- Book and Microform
- Author:
- Thissen, David
- Description:
-
- [Washington, D.C.] : Distributed by ERIC Clearinghouse, 1984
- 35 p.
- Summary:
-
Simulation studies of the performance of (potentially) robust statistical estimation produce large quantities of numbers in the form of performance indices of the various estimators under various conditions. This report presents a multivariate graphical display used to aid in the digestion of the plentiful results in a current study of Item Response Theory (IRT) ability estimators. Called XTREE, or the "Christmas Tree Glyph," the display has a vertical line or "trunk" with angled lines or "branches" for each estimator which display bias (left) and random variance (right). The sum of the two branch lengths represents the mean square error (MSE). Appendix A is a tabular presentation of the results to illustrate the data interpretation problem. Appendix B contains the XTREE computer programs (written in FORTRAN IV for a Honeywell DPS computer system and a Hewlett-Packard 7470A plotter). (Author/BS)
- Notes:
-
- Sponsoring Agency: Air Force Human Resources Lab., Brooks AFB, TX.
- Contract Number: F41689-82-C-0020.
- Researchers.
- May also be available online. Address as at 14/8/18: https://eric.ed.gov/
- Reproduction:
- Microfiche. [Washington D.C.]: ERIC Clearinghouse microfiches : positive.
- Subject:
- Other authors/contributors:
- Available From:
- ERIC
- Copyright:
-
In Copyright
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Copyright status was determined using the following information:
- Material type:
- Literary Dramatic Musical
- Published status:
- Published
- Publication date:
- 1984
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