An item response curves analysis of the Force Concept Inventory
The IRCs for all 30 questions on the FCI using the approach of Morris et al. (Ref. 2). This figure is analogous to Fig. 4 in Wang and Bao (Ref. 4). Each graph shows the percentage of respondents (vertical axis) at each ability level (horizontal axis) on a given item selecting a given answer choice: + = 1; ⋆ = 2; ⋄ = 3; △ = 4; □= 5.
A comparison of the percent correct (this work, vertical axis) with the difficulty parameter (“b,” horizontal axis) from Wang and Bao (Ref. 4).
IRCs for a “dichotomously” scored Question 13 from the FCI.
The percentage of students who responded correctly to each question on the FCI.
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