Psychometric Experts
Why does DRC continue to grow and thrive in the educational assessment, survey services and document processing industries? The answer is simple: our people. Our psychometric experts provide us with the best knowledge and expertise in the country, and they have helped DRC become one of the most sought-after companies for delivering high-quality differentiated services.
DRC's highly qualified, in-house psychometric experts possess a collective knowledge that spans a variety of measurement models, methodologies, and settings in social science measurement.
Our psychometric services include the following:
- Item analysis
- Differential Item Functioning (DIF)
- Scaling and equating
- Reliability
- Decision consistency
- Standard setting
- Generalizability studies
- Item and scale drift studies
- Customized reporting
- Special studies
Scaling and equating- Proficient in key industry-accepted scaling and equating models, including Rasch and three-parameter IRT.
- Utilize WINSTEPS© and ParScale© to generate the item parameters used for data review, item banking, and test form construction.
- Facilitate a collaborative environment so we can train you and your staff in the scaling and equating process, allowing you to perform an independent check and verification of the process.
Standard setting- Experienced in both examinee and test-centered models.
- Test-centered procedures we have implemented for our clients include the Mondified-Angoff, Bookmark, Borderline and Contrasting Group, and Body of Work procedures.
- Pioneered procedures for setting standards for non-standard student populations, such as Limited English Proficient and students with significant disabilities.
Forms construction- Designed and developed First Form©, a technical infrastructure for test assembly, which ensures that forms construction is both efficient and within content and psychometric specifications.
- First Form© interfaces with WINSTEPS©, ParScale©, and third-party statistical programs, and features flexible constraint handling that reflects industry standards.