I have read some paper,they do not use 2nd LV.
they use all first LV link to the endogenous LV.
is these correct?
I also think ,maybe it is right .why we need 2nd LV?
IF the correlationship of first LV is low.we can use it directly.
or it depens on my theory?
anyone give some comment?
Why we need 2nd LV?
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mengchuanjin
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Why we need 2nd LV?
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