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Remarks
merge can perform both one-to-one and match merges. In either case, the variable _merge (or the variable specified in
_merge() if provided) is added to the data containing
_merge==1 obs. from master data
_merge==2 obs. from only one using dataset
_merge==3 obs. from at least two datasets, master or using
update can be used only when there is one using file. When update is specified, the codes for _merge are
_merge==1 obs. from master data
_merge==2 obs. from using data
_merge==3 obs. from both, master agrees with using
_merge==4 obs. from both, missing in master updated
_merge==5 obs. from both, master disagrees with using
When multiple using files are specified, a set of summary variables is created, as long as nosummary is not used.
These summary variables are named _merge1 (related to the first using dataset), _merge2 (related to the second using
dataset), etc. (or, once again, the variable specified in _merge() if provided, followed by the number of the using
file). These variables will contain
_mergek==0 obs. not present in corresponding using dataset
_mergek==1 obs. present in corresponding using dataset
Variable labels identifying the dataset associated with each summary variable are attached to these summary variables.
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