Item Analysis

Detailed statistics and distractor analysis for each item with difficulty and discrimination

Filters & Display Settings

Item Statistics

Click "View Details" button to see detailed distractor analysis

Academic References & Interpretation Guidelines

Difficulty (p-value)

  • 0.40 - 0.60: Moderate (Optimal)
  • 0.60 - 0.80: Easy (Acceptable)
  • 0.20 - 0.40: Difficult (Acceptable)
  • < 0.20 or > 0.80: Needs Revision

Discrimination (r_pb)

  • ≥ 0.40: Excellent
  • 0.30 - 0.39: Good
  • 0.20 - 0.29: Fair (Needs Improvement)
  • < 0.20: Poor (Needs Revision)
  • < 0.00: Negative (Reject)

Important Notes

Items with negative discrimination (rpb < 0) indicate that high-scoring students answered incorrectly more often than low-scoring students. The answer key should be verified or the item should be revised.

References

  • Ebel, R. L., & Frisbie, D. A. (1991). Essentials of educational measurement (5th ed.). Englewood Cliffs, NJ: Prentice Hall.
  • Haladyna, T. M., & Rodriguez, M. C. (2013). Developing and validating test items. New York: Routledge.
  • Allen, M. J., & Yen, W. M. (1979). Introduction to measurement theory. Monterey, CA: Brooks/Cole.
  • Crocker, L., & Algina, J. (1986). Introduction to classical and modern test theory. Fort Worth, TX: Harcourt Brace Jovanovich.