不好意思,想請教一下
我用stata做 CD teat時,發現有些變數無法顯示數值(如下 . )
請問 um 和 gini_net 的CD-test裡出現的 . 是什麼意思?
我應該如何解決這個問題?
. xtcd um lfr gini_net
Average correlation coefficients & Pesaran (2004) CD test
Variables series tested: um lfr gini_net
Group variable: id
Number of groups: 152
Average # of observations: 22.15
Panel is: unbalanced
---------------------------------------------------------
Variable | CD-test p-value corr abs(corr)
-------------+-------------------------------------------
um | . . . .
-------------+-------------------------------------------
lfr | 101.47 0.000 0.202 0.654
-------------+-------------------------------------------
gini_net | . . . .
---------------------------------------------------------
Notes: Under the null hypothesis of cross-section
independence CD ~ N(0,1)


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