Benefits of air quality improvement in Klang Valley Malaysia
by Rafia Afroz, Mohd Nasir Hassan, Muhamad Awang, Noor Akma Ibrahim
International Journal of Environment and Pollution (IJEP), Vol. 30, No. 1, 2007

Abstract: The study evaluated the comparative reliability of different question formats of contingent valuation method by resurvey of the same households nine months after their original survey. The test-retest correlations are statistically significant at 1% level. Comparative reliability of different question formats has been tested comparing the test-retest correlations of these methods. This test has revealed that there is no significant difference in the test-retest correlations between the different question formats for either level A (reduction of the concentration of PM10 by 10%) or level B (reduction of the concentration of PM10 by 20%) air quality improvement.

Online publication date: Thu, 12-Jul-2007

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