Abstract
The results of household interviews provide essential data for the formulation of noise control policies. However, only a few studies have investigated the reliability of such data, in terms of a test‐retest comparison. To help provide better evidence of reliability, 212 persons in the vicinity of Toronto International Airport were re‐interviewed in the summer of 1979, using essentially the same questionnaire they had answered in the summer of 1978. To test whether the reliability is affected by noise level, the sample was stratified by both aircraft and road traffic noise levels. Results show that, on an individual level, reliability of attitude scores is not particularly high (correlation coefficients of 0.50 ± 0.05 for several scales for both aircraft and road traffic noise), and that the reliability is affected by noise level. On the aggregate level (based on the percentage of the population reporting certain responses), much better reliability can be obtained. For attitude data, percent highly annoyed is a much more reliable indicator than percent at all annoyed (r as high as 0.91 vs r no higher than 0.39).
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