简述时间取样法的要求。
①只适用于经常发生的行为;②只适用于观察外显行为,不宜观察内在行为;③必须要确定观察目的、被试的数量、观察的范围和时间;④对观察行为与事件必须给予明确的操作定义;⑤应当制定取样编码记录表;
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