简述选择性偏倚的控制方法。
答:(1)科研设计严谨(1分),设立并严格掌握研究对象的纳入与排除标准(1分)。(2)设立对照组(1 分)。(3)提高应答率(1 分)。(4)减少失访率(1 分)。
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上一篇:Complete the following sentence with a (compound) word derived from the one(s) given in the bracket. Write your word on the answer sheet.The husband decided not to complain in the ( ) of his wife any more. (present)
Complete the following sentence with a (compound) word derived from the one(s) given in the bracket. Write your word on the answer sheet.
The husband decided not to complain in the ( ) of his wife any more. (present)
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