An Alternate Definition of the ETS Delta Scale of Stem Difficulty
- Author(s):
- Holland, Paul W.; Thayer, Dorothy T.
- Publication Year:
- 1985
- Report Number:
- RR-85-43
- Source:
- ETS Research Report
- Document Type:
- Report
- Page Count:
- 15
- Subject/Key Words:
- Delta Index, Difficulty Level, Item Analysis, Statistical Analysis, Test Construction
Abstract
This note develops an alternative definition of the "delta scale" of item difficulty that is used at ETS. A comparison is given with the traditional definition of the delta scale that is based on the normal distribution. Some advantages of the alternative scale are mentioned. (15pp.)
Read More
- Request Copy (specify title and report number, if any)
- http://dx.doi.org/10.1002/j.2330-8516.1985.tb00128.x