Statistics and Data Science Seminar
Dr. Hongwen Guo
ETS
Predicting Right Score Distributions from Data Collected under Formula Score Instructions
Abstract: Under formula score instruction (FSI), test takers may omit items instead of guessing. If the students are required to answer every items (under the rights only scoring instruction, ROI), the score distribution will be different. In this study, we tried to model the data using a simple statistical model and provide a formula to predict the score distribution under ROI based on the score distribution and the omit rate observed under FSI. A preliminary investigation of the guessing parameter is presented in the paper. Based on the data used in the study, the guessing parameter may be close or slightly lower than the chance score.
Wednesday March 19, 2014 at 4:00 PM in SEO 636