In Reply.—The UCLA/Wadsworth Veterans Administration Laryngeal Physiology Laboratory published an article in the January 1989 issue of the Archives1 pointing out that relatively inexpensive computer systems could be adapted for the objective assessment of voice. In so doing, we tried to peak and uses these as the moments of opening and closing. We have additionally evaluated the 90th and 70th percentiles with this method. A Pearson's correlation matrix comparing the automated to the interactive method is shown in the Table. The results demonstrated that not only was there a high correlation among the automated speed quotient indexes but, more importantly, there was a high correlation between the automated indexes and those determined by hand picking of moments of glottal opening, peak opening, and closing. Furthermore, an additional quotient, which we have termed the slope quotient (defined as the peak velocity of opening over the peak velocity of closing),
BERKE GS. Voice Analysis Revisited-Reply. Arch Otolaryngol Head Neck Surg. 1989;115(9):1133–1134. doi:10.1001/archotol.1989.01860330123034
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