Our Psychometric Services
Educational Data Systems specializes in psychometrics to measure student achievement. We utilize a wide array of models and statistics, specializing in the Rasch family of psychometric models. Our precision scaling services place students on reliable, linear measurement scales. Rasch Models provide a methodology for producing “objective” measures (student scores that will reproduce from test to test). They are also useful in test equating (getting the results from one test to be comparable to those from another test), and in making sure that test items are fair and definitive.
Test equating ultimately involves psychometrically linking many different tests together so that they behave like one large, cohesive test. This enables us to put all students who take equated tests on the same measurement scale, even if they took different tests.
Our psychometric testing services include test building, reliability and validity analysis, equating, item analysis, standard setting, and item calibration. We help you to:
- Learn the demographic characteristics of your students
- Determine how different groups perform
- Compare all of your students against the same measurement scale
- Ensure that test items are fair and the test forms are properly constructed
- Obtain reliable measures from open-ended, performance-task, constructed-response, and essay items
From tests to studies to surveys, psychometric assessment tools can be used to develop, validate, analyze, interpret, and optimize a variety of items. Our team takes pride in its ability to extract clear truths from complicated data in the form of simple graphs and tables that tell the story. For the more detail-oriented, we also produce thorough and comprehensive technical reports.
Looking for more psychometric assessment resources?
We periodically update our blog and publication library with helpful documents to aid you in your discovery. Here are a few psychometric resources: