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ERIC Number: ED400276
Record Type: Non-Journal
Publication Date: 1996-Apr
Pages: 19
Abstractor: N/A
Reference Count: N/A
How Contaminated by Guessing Are Item-Parameter Estimates and What Can Be Done about It?
Schnipke, Deborah L.
When running out of time on a multiple-choice test, some examinees are likely to respond rapidly to the remaining unanswered items in an attempt to get some items right by chance. Because these responses will tend to be incorrect, the presence of "rapid-guessing behavior" could cause these items to appear to be more difficult than they really are. This study used simulated data from a normal distribution with a mean of 0 and a standard deviation of 1 for 5,000 examinees. It found that item response theory parameters are affected by rapid-guessing behavior, and that the Item Characteristic Curves (ICCs) were generally lower than the true ICCs. Using response times, an attempt was made to remove responses that appeared to be the result of rapid-guessing behavior. Two methods of removing responses were used. After removing the fast responses (rapid guesses), the item parameters and ICCs were recovered more accurately. The two methods of classifying responses as rapid guesses and removing them worked equally well in recovering the true parameters and ICCs. (Contains two tables, eight figures, and seven references.) (SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A