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一问卷调查中,常遇到无回答的问题。无回答包括样本无回答或项目无回答两类。样本无回答即被调查单位(或人)没有接受调查。项目无回答是指调查中被调查单位(或人)接受了调查,但对调查的某些项目没有提供有效的回答。当然,它们两者之间也有联系:样本无回答就是所有的项目无回答。无回答最终影响数据分析的准确性。如何尽量把无回答率控制到最低限
A questionnaire survey, often encountered the problem of no answer. No answer includes sample no answer or item no answer two categories. No answer to the sample that the unit under investigation (or people) was not investigated. No answer to the project refers to the surveyed units (or people) were investigated, but did not provide a valid answer to some items of the survey. Of course, there is also a connection between them: no answer to the sample is that all the items have no answer. No answer ultimately affects the accuracy of the data analysis. How to minimize the non-response rate as far as possible?