| Re: Keeping caseid in and keeping missing observations out when using Stata "collapse" [message #6672 is a reply to message #6666] |
Thu, 25 June 2015 11:53   |
Bridgette-DHS
Messages: 3202
Registered: February 2013
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Senior Member |
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Following is a response from Senior DHS Stata Specialist, Tom Pullum:
If you construct a cluster-level variable using the collapse command, it is not necessary to use weights at all, because everyone in the same cluster has the same weight. To confirm this, you could collapse WITH weights and then collapse WITHOUT weights, and compare the two sets of numbers. They should be exactly the same.
However, if you want to collapse for a larger aggregate, such as a district or region, which includes more than one cluster, you definitely should use weights as part of the collapse.
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