Applying Item Response Theory to Science Educational Measurement: Galt and Tips (Ⅱ)

Author: Rong-Fu Hsu(Department of Physics, National Taiwan Normal University)

Abstract：

This study developed the techniques for representing latent traits in Science Process Skills and Reasoning Ability measurement based on item response theory.
The three basic assumptions and specific objectivity in Rasch Model were examined in view of science education. Both linear logistic trait models and component latent trait models for accounting the nature of the abilities measured in test situations were also proposed.
Results of the study revealed that the predicted-observed patterns were affected by latent traits underlying each item and the stems for each item. The analysis might demonstrate the high sensitivity and resolution in detecting bias of test items of Rasch model in this study.

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