严同学2019-04-17 11:28:50
在autocorrelation中 DWtest 里d(l)与d(u)在线段上是位于2的左侧,想问下这两个值会不会出现在2的右侧,如果会,那么4-du;4-dl就会调到2的左侧?
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Chris Lan2019-04-17 13:36:49
严同学你好,
理论上来说我们的习题,还没有发现这种情况的出现。关于这块我们的原版书也没有给出详细的说明,说du和dl是怎么查出来的。相关的内容在原版书第一册P357页,这块的说明,我帮你摘录出来,你也可以再去看看原版书。
We should reject the null hypothesis of no serial correlation if the Durbin–Watson statistic is below a critical value, d*. Unfortunately, Durbin and Watson also showed that, for a given sample, we cannot know the true critical value, d*. Instead, we can determine only that d* lies either between two values, du (an upper value) and dl (a lower value), or outside those values. Figure 3 depicts the upper and lower values of d* as they relate to the results of the Durbin–Watson statistic.
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另我我在网上找了一些相关的资料,希望对你能有所帮助。
DW分布临界值表
https://wenku.baidu.com/view/b661fefff121dd36a32d8280.html
DW检验,查表得du是个小于2的数,du比4-du小,这时怎么判断呢?
https://bbs.pinggu.org/thread-2595562-1-1.html
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+上传图片
