st: How to merge individual records to groups in a large dataset, w/o using collapse

[Allon Crazy <allon_crazy@yahoo.com>]

I am wondering how to merge individual records to
groups for an extremely large dataset (20 million
observations), without using collapse. I tred
collapse, but my computer would not offer enough
memeory for it because the dataset is too huge. I
tried egen, but egen does not take sampling weights
into consideration. I am wondering whether there is
another way or other options. 

I would grealy appreciate. 


 
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