st: Collapse in GMM

["21443017" <wzhan01@qub.ac.uk>]

Dear all,

I am using -xtabond2- to run GMM-estimation. I know there is a code
-collapse- can be included in -gmmstyle-. I was just wondering is there any
criteria to clarify when I need to include collapse and when I can neglect
it.


Many Thanks

Best Wishes

Wenwen  


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