The Relative Difficulty Ratio—a Test and Item Index
- 1 July 1981
- journal article
- research article
- Published by SAGE Publications in Educational and Psychological Measurement
- Vol. 41 (2) , 333-339
- https://doi.org/10.1177/001316448104100210
Abstract
The Relative Difficulty Ratio (RDR) was developed as an index of test or item difficulty for use in situations in which raw score means or item p-values are not directly comparable because of chance score differences. Computational RDR are described. Data from the literature are used to illustrate applications of the RDR at both the test and item level.Keywords
This publication has 3 references indexed in Scilit:
- TEST PERFORMANCE UNDER THE CONDITION OF KNOWN ITEM DIFFICULTYJournal of Educational Measurement, 1978
- The Effect of Item Format on Reliability and Validity: a Study of Multiple Choice and True-False Achievement TestsEducational and Psychological Measurement, 1974
- MULTIPLE CHOICE VERSUS TRUE‐FALSE: A COMPARISON OF RELIABILITIES AND CONCURRENT VALIDITIESJournal of Educational Measurement, 1973