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By separating respondents in a survey of farmers into thosewho refused to be interviewed and were converted, those whowere hard to reach, and those who gave no problems, we can estimatenonresponse bias from refusers not converted and respondentsnot reached. We show that for attitude questions the refusalbias is serious, ranging from 2 to 4 percent on many attitudes,and very often larger than the standard error in surveys ofordinary size. 相似文献
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