1992．第7卷（Vol. 7）．pp. 3340
The Assessment of Practical Ability in Science Using the Partial Credit Model
Malcolm J. ROSIER
A science practical test was given to a sample of 220 students in 74 schools in Years 5 and 9 in Victoria (Australia). There were three problems, and four tasks per problem. The tasks were designed to minimise the supervision at the classroom level. A total test score was calculated using the partial credit version of the item response theory model. Each category of each of the 12 tasks was assigned a score (in logits) on the underlying scale that measured practical ability. The score for each student was measured as the location of the student on the scale. In order to simplify the description, these scores were then divided into five levels of science practical ability.