Reply to Comment on the Reliability of the S/Z Ratio in Normal Children's Voices The comments made by Madison and Seikel that a correlation is customarily used to show reliability for a test-retest situation is of course correct. This works especially well when the retest scores are slightly higher than the initial test scores, and the correlation shows that the same rank order ... Letter to the Editor
Letter to the Editor  |   January 01, 1990
Reply to Comment on the Reliability of the S/Z Ratio in Normal Children's Voices
 
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Research Issues, Methods & Evidence-Based Practice / Speech, Voice & Prosody / Letters to the Editor
Letter to the Editor   |   January 01, 1990
Reply to Comment on the Reliability of the S/Z Ratio in Normal Children's Voices
Language, Speech, and Hearing Services in Schools, January 1990, Vol. 21, 61. doi:10.1044/0161-1461.2101.61
History: Received June 19, 1989 , Accepted July 3, 1989
 
Language, Speech, and Hearing Services in Schools, January 1990, Vol. 21, 61. doi:10.1044/0161-1461.2101.61
History: Received June 19, 1989; Accepted July 3, 1989
The comments made by Madison and Seikel that a correlation is customarily used to show reliability for a test-retest situation is of course correct. This works especially well when the retest scores are slightly higher than the initial test scores, and the correlation shows that the same rank order was maintained even though the scores shifted as a whole.
In the present study, however, a correlation would not be helpful, because the whole purpose of the project was to show that the S/Z ratios would show essentially no shift on the retest.
The second point in the letter, referring to the S/Z ratio as a discrepant indicator of mass vocal-fold lesions is particularly thought provoking. Because the probability of the S/Z accuracy varies with the value (i.e., the probability improves with extremely high or extremely low S/Z values), it is basically worthless as a clinical tool if the values are close to 1.00.
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