HCItestretest dataset consists of the responses of 45
  students to Homeostasis Concept Inventory (HCI). It contains answers to 20
  multiple-choice items, scored items, identifier of test/retest, total
  score, gender membership and identifier whether students plan to major in
  life sciences. The data are organized so that each pair of subsequent rows
  belongs to one student. Students took no courses on homeostasis between the
  test and retest.
data(HCItestretest)HCItestretest is a data.frame consisting of 90
  observations on the 44 variables.
Multiple-choice items of the HCI test.
Scored items of the HCI test, "0" incorrect,
  "1" correct.
Identifier of test vs retest, "test" test,
  "retest" retest after.
Total test score.
Gender membership, "M" male, "F" female.
Identifier whether student plans to major in the life sciences.
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. 10.1187/cbe.16-10-0305
HCIdata for HCI full dataset
HCI for HCI dichotomous dataset
HCItest for HCI multiple-choice dataset
HCIkey for key of correct answers for HCI
HCIgrads  for HCI dataset of graduate students
HCIprepost for HCI pretest and posttest scores