Direct Magnitude Estimation and Interval Scaling of Stuttering Severity The appropriateness of direct magnitude estimation and interval scaling for assessing stuttering severity was investigated by determining whether the continuum of the stutterers' judged severity was prothetic or metathetic. As operationally defined by Stevens, prothetic continua show a curvilinear relation between magnitude estimates and interval scale values of the same ... Research Article
Research Article  |   December 01, 1983
Direct Magnitude Estimation and Interval Scaling of Stuttering Severity
 
Author Affiliations & Notes
  • Nicholas Schiavetti
    State University of New York, Geneseo
  • Pat Richard Sacco
    State University of New York, Geneseo
  • Dale Evan Metz
    National Technical Institute for the Deaf, Rochester Institute of Technology, Rochester, New York
  • Ronald W. Sitler
    State University of New York, Geneseo
Article Information
Research Articles
Research Article   |   December 01, 1983
Direct Magnitude Estimation and Interval Scaling of Stuttering Severity
Journal of Speech, Language, and Hearing Research, December 1983, Vol. 26, 568-573. doi:10.1044/jshr.2604.568
History: Received July 26, 1982 , Accepted March 15, 1983
 
Journal of Speech, Language, and Hearing Research, December 1983, Vol. 26, 568-573. doi:10.1044/jshr.2604.568
History: Received July 26, 1982; Accepted March 15, 1983

The appropriateness of direct magnitude estimation and interval scaling for assessing stuttering severity was investigated by determining whether the continuum of the stutterers' judged severity was prothetic or metathetic. As operationally defined by Stevens, prothetic continua show a curvilinear relation between magnitude estimates and interval scale values of the same set of stimuli, whereas metathetic continua show a linear relation between these scale values. The stuttering severity of 20 stutterers was scaled by three groups of 15 listeners who used interval scaling, direct magnitude estimation with standard/modulus, and direct magnitude estimation without standard/modulus. The results indicated that the two sets of direct magnitude estimation scale values were related to the interval scale values in the curvilinear fashion that is typical of prothetic continua. These findings suggest that direct magnitude estimation is preferable to interval scaling for measuring stuttering severity.

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