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求助二级原版书数学

求助数学二级原版书reading13, 17题 A:答案说t-statistcs is about 2, 这个2是怎么来的 DW约等于2(1-r), 请问r是什么 谢谢

2是critical value,是查表查出来的,但是一般5% significant的critical value最好能记忆一下。r is the sample correlation between the regression residuals from one period and those from the previous period.
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