The H-H index is based on two characteristics of the students’ item responses: the number of exact errors in common, EEIC, and the number of different responses, D. The H-H index is expressed as a ratio of these two numbers: H-H = EEIC/D.
Two students are said to have an “exact error in common” when they both select the same distractor to an item, that is, when they choose exactly the same incorrect answer to an item.
Harpp, Hogan, & Jennings (1996) reported on their observation of the H-H index’s behavior, tracking it over years of application, reporting they found it to be “a powerful indicator of copying”. They wrote:
The H-H index is based on two characteristics of the students’ item responses: the number of exact errors in common, EEIC, and the number of different responses, D. The H-H index is expressed as a ratio of these two numbers: H-H = EEIC/D.
Two students are said to have an “exact error in common” when they both select the same distractor to an item, that is, when they choose exactly the same incorrect answer to an item.
Harpp, Hogan, & Jennings (1996) reported on their observation of the H-H index’s behavior, tracking it over years of application, reporting they found it to be “a powerful indicator of copying”. They wrote:
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