VCEDataService.ppt

Relationship between GAT scores and VCE Study Scores The last slide shows that for Biology, the higher the ability of the group (as measured by the GAT) the higher the VCE study score The VCE Data Project established that overall, the GAT is a very good predictor of VCE study scores Example: Relationship between GAT (Comm) scores and English Study Scores Predicting VCE Study Scores The VCE Data Project established clearly that, other things being equal, you can expect higher levels of performance from a student who has greater ability; is in a class with more able students; is female. Adjusted Estimates VCEDS calculates what each of your students could have been expected to get on the basis of their ability, as indicated by their three GAT component scores; the average GAT performance of the subject group in their school; and their gender. It then compares your students’ results to those that would have been expected. The difference is called an adjusted score Aggregated across students, it is called an adjusted estimate for the group. Example using just the GAT (Comm) Score to predict English study scores Students who scored 25 on the GAT would be predicted to score 26 for their VCE English study score Example (cont) However, this student actually scored 35 for English which is 9 study score points higher than we would have predicted On the other hand, this student actually scored 18 for English which is 8 study score points lower than we would have predicted How does VCEDS report Adjusted Estimates? If students performed precisely as predicted in a given study taking into account their abilities and their gender composition, then the group will have an adjusted estimate of zero. If the students perform less well than predicted, the group will have a negative adjusted estimate. If students perform better than predicted, the group will have a positive adjusted estimate. What sort on numbers do the Adjusted Estimates produce? The scale on which adjusted estima