Are .d,.e and.r respectively mean don't know, don't apply and refuse to answer?

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ruthqi1989
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注册时间： 周四 9月 06, 2018 9:46 am

Are .d,.e and.r respectively mean don't know, don't apply and refuse to answer?

帖子 由 ruthqi1989 » 周二 9月 11, 2018 4:22 pm

In the charls data, .d .e and.r represent the missing values respectively.I would like to know the specific reasons for the missing value ,are they respectively mean do not know, do not apply and refuse to answer?
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