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Journal of Speech and Hearing Research Vol.24 441-445 September 1981.
© American Speech-Language-Hearing Association
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Construct Validity of Direct Magnitude Estimation and Interval Scaling of Speech Intelligibility

Evidence from a Study of the Hearing Impaired

Nicholas Schiavetti 1
Dale Evan Metz 2

Ronald W. Sitler 1
1 State University of New York, Geneseo
2 National Technical Institute for the Deaf at Rochester Institute of Technology, New York

The appropriateness of direct magnitude estimation and interval scaling procedures for assessing the speech intelligibility of hearing-impaired adults was investigated by determining whether the continuum of the talkers' intelligibility was prothetic or metathetic. The intelligibility of 20 hearing-impaired talkers was scaled by 20 listeners using direct magnitude estimation and by 20 listeners using interval scaling. The two sets of scaling data were related in the curvilinear fashion that is typical of prothetic continua, indicating better construct validity for direct magnitude estimation than for interval scaling of speech intelligibility.

Submitted on July 7, 1980
Accepted on September 5, 1980


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