HCIkey is a vector of factors representing correct answers of
data.frame with 20 values representing correct answers to items of
For more details see
Jenny L. McFarland
Biology Department, Edmonds Community College
McFarland, J. L., Price, R. M., Wenderoth, M. P., Martinkova, P., Cliff, W., Michael, J., ... & Wright, A. (2017). Development and validation of the homeostasis concept inventory. CBE-Life Sciences Education, 16(2), ar35.
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