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Table 5 Plackett-Burman designs: factor levels

From: A computational study of auditory models in music recognition tasks for normal-hearing and hearing-impaired listeners

Factors 1st level 2nd level
Mean interval <2.5 >3.5
Onsets accompaniment <0.4 >0.6
Dynamic <0.5 >1.0
Accompaniment Piano Strings
Mean pitch D4 D5
Song (tone) duration 12 s 25 s
Pitch difference: [−6,6] [12,24]
melody − accompaniment Half tones Half tones