This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Charter, R. A. Articles by Feldt, L. S. Search for Related Content Social Bookmarking                   What's this?

The Relationship between Two Methods of Evaluating an Examinee's Difference Scores

Long Beach VA Medical Center, Long Beach, California

Leonard S. Feldt

The University of Iowa

The "nonoverlapping intervals" and "reliable difference" approaches for assessing difference scores are compared and shown to be consistent alternatives when the proper z is used to construct confidence intervals. Formulas for computing the probabilities of correct interpretation (power), overinterpretation, misinterpretation, and underinterpretation for four popular confidence interval approaches and the reliable difference approach are presented. The probability formulas show that the intuitive inference concerning the statistical significance level of nonoverlapping intervals is incorrect. The limitations of the nonoverlapping intervals approach in applied situations are discussed. It appears that in most situations the reliable difference is the easiest to apply.

CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this?

This article has been cited by other articles:

				R. A. Charter and L. S. Feldt Confidence Intervals for True Scores: Is There a Correct Approach? Journal of Psychoeducational Assessment, December 1, 2001; 19(4): 350 - 364. [Abstract] [PDF]