tone
Bricker's Tone-Ringer Preference Data

### Description

The tone.appeal data set is a matrix that gives standardized ratings of 100 tones (rows) for 43 subjects (columns). The ratings are standardized so that each subject has mean 0 and biased variance 1.
Source
Bricker, P.J. (1971). Listener Evaluation of Simulated Telephone Calling Signals. Bell System Technical Journal 50: 1559--1578.
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