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December 1956


AMA Arch Otolaryngol. 1956;64(6):477. doi:10.1001/archotol.1956.03830180027005

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In the intercorrelation matrix of hearing losses for seven tones and a PB speech list, reported in "A New Formula for Using the Audiogram to Predict Speech Hearing Loss," which appeared in the February, 1956, issue of the Archives, an erroneous grouping of the "O" category of hearing loss has led to some incorrect correlations, especially when one of the frequencies of any pair had numerous "O" items. Dr. Glorig and Dr. Quiggle have very kindly called this to the attention of the authors, who wish to set the record straight.

A correct intercorrelation matrix will be sent to anyone upon request to the authors, or the reader can compute any desired value from the raw data furnished in the article.

A recomputation of the weights to be assigned to the hearing loss at any frequency reveals only three frequencies of real importance: 500, 1000, and 2000 cps. Losses at

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