合并资料 (Aggregating Data to Groups)-1 虽然HLM可以处理跨层次的构念，但是，它的依变项一定要是最低层次的，否则不能应用。
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aggregating data to groups
将数据聚合到组中
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The central assumption of his project was that aggregating the data from these groups would present a picture of violence in El Salvador complete enough to be of use to investigators.
FORBES: Patrick Ball on the Perils of Misusing Human Rights Data
Due to a three-decade-old court decision, the newspaper could only publish data aggregating groups of 10 doctors or more.
WSJ: How The Wall Street Journal Crunched the Medicare Numbers
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