ERIC Number: ED467806
Record Type: Non-Journal
Publication Date: 1999-Mar
Reference Count: N/A
Modeling Item Response Times with a Two-State Mixture Model: A New Approach to Measuring Speededness. Law School Admission Council Computerized Testing Report. LSAC Research Report Series.
Schnipke, Deborah L.; Scrams, David J.
Speededness refers to the extent to which time limits affect test takers' performance. With regard to the Law School Admission Test (LSAT), speededness is currently measured by calculating the proportion of test takers who do not reach each item on the test. These proportions typically increase slightly toward the end of the test, indicating that the LSAT is partially speeded. Because the LSAT is number-right scored (i.e., no points are subtracted for incorrect responses), test takers are encouraged to guess on items rather than leave them blank. Therefore, this measure of speededness for the LSAT probably underestimates the true amount of speededness on the test. A more accurate assessment of speededness should also reflect the tendency of test takers to guess rapidly on items as time expires. This rapid guessing component of speededness can be estimated by modeling response-times with a two-state mixture model, as demonstrated with data from a computer-administered reasoning test, the analytical measure of the Graduate Record Examination for 7,218 test takers. The combined effect of unreached items and rapid guessing provides a more complete measure of speededness than has previously been available. (Contains 1 table, 8 figures, and 17 references.) (Author/SLD)
Publication Type: Reports - Research
Education Level: N/A
Authoring Institution: Law School Admission Council, Princeton, NJ.
Identifiers - Assessments and Surveys: Graduate Record Examinations; Law School Admission Test