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Direct linkChafouleas, Sandra M.; Christ, Theodore J.; Riley-Tillman, T. Chris – Educational and Psychological Measurement, 2009
Generalizability theory is used to examine the impact of scaling gradients on a single-item Direct Behavior Rating (DBR). A DBR refers to a type of rating scale used to efficiently record target behavior(s) following an observation occasion. Variance components associated with scale gradients are estimated using a random effects design for persons…
Descriptors: Generalizability Theory, Undergraduate Students, Scaling, Rating Scales
Huang, Chiungjung – Educational and Psychological Measurement, 2009
This study examined the percentage of task-sampling variability in performance assessment via a meta-analysis. In total, 50 studies containing 130 independent data sets were analyzed. Overall results indicate that the percentage of variance for (a) differential difficulty of task was roughly 12% and (b) examinee's differential performance of the…
Descriptors: Test Bias, Research Design, Performance Based Assessment, Performance Tests
