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CHAPTER 6: ITEM CALIBRATION, SCALING, AND EQUATING

Item Response Theory models were used to calibrate the high school assessments. In the calibrations, blank responses were treated as incorrect responses. Selected response items were scaled using a three-parameter logistic model (3PL). Constructed response items were scaled with a two-parameter partial credit (2PPC) model. A brief explanation of the models can be found in Maryland High School Assessment Program 2003 Technical Report (February 29, 2004 CTB/McGraw-Hill).

Included in Chapter 6 are the following two related reports.

6.1 Equating the 2002 Maryland High School Assessments

This one-page summary describes the procedure of calibration and equating following the 2002 administration of the high school assessments.

6.2 Summaries of Methods and Procedures for Calibrating, Equating, and Scoring the 2003 Maryland High School Assessments

This is a 10-page, detailed summary of the calibration and equating procedures used following the 2003 administration of the high school assessments.


Contact Information
Gary Heath, Assistant State Superintendent

Division of Accountability and Assessment
Maryland State Department of Education

200 West Baltimore Street
Baltimore, MD 21201
Maryland State Department of Education
200 West Baltimore Street
Baltimore, MD 21201
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