Farmers who dropped out of the survey in the first section of thequestionnaire were treated as non-respondents and their informa-tion was used in the analysis of unit non-response bias. On the other hand data from farmers who dropped out of the survey in thesubsequent sections were used to test for item non-response bias(De Leeuw et al., 2003). The tests indicated non-respondents weremainly older farmers, thereby resulting in an over-representationof young farmers. However, farmers with fully completed and par-tially completed questionnaires were not statistically different.Although the over-representation of younger farmers could biasthe outcome of our analysis, the problem may only be minimalgiven the current trends of a decrease in the number of older farm-ers in Denmark (European Commission, 2012).
The study thereforeutilized the 267 complete cases.Based on four key questions (Appendix A), the analysis was con-ducted in two stages. Firstly a descriptive analysis of the generalrespondents’ perception of water quality, attitudes regarding theeffects of pollution reduction measures and the preferences for var-ious nutrients mitigation measures implementation strategies wasconducted. Secondly, the factors influencing the farmers’ adoptionof voluntary nutrient reduction measures and their perception ofwater quality were analyzed.
Farmers who dropped out of the survey in the first section of thequestionnaire were treated as non-respondents and their informa-tion was used in the analysis of unit non-response bias. On the other hand data from farmers who dropped out of the survey in thesubsequent sections were used to test for item non-response bias(De Leeuw et al., 2003). The tests indicated non-respondents weremainly older farmers, thereby resulting in an over-representationof young farmers. However, farmers with fully completed and par-tially completed questionnaires were not statistically different.Although the over-representation of younger farmers could biasthe outcome of our analysis, the problem may only be minimalgiven the current trends of a decrease in the number of older farm-ers in Denmark (European Commission, 2012). The study thereforeutilized the 267 complete cases.Based on four key questions (Appendix A), the analysis was con-ducted in two stages. Firstly a descriptive analysis of the generalrespondents’ perception of water quality, attitudes regarding theeffects of pollution reduction measures and the preferences for var-ious nutrients mitigation measures implementation strategies wasconducted. Secondly, the factors influencing the farmers’ adoptionof voluntary nutrient reduction measures and their perception ofwater quality were analyzed.
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