Transcription of Stata: Software for Statistics and Data Science | Stata
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Example: biology
Stata: Software for Statistics and Data Science | Stata
merge datasetsDescriptionQuick startMenuSyntaxOptionsRemarks and examplesReferencesAlso seeDescriptionmergejoins corresponding observations from the dataset currently in memory (called the masterdataset) with those (called the using dataset), matching on one or more perform match merges (one-to-one, one-to-many, many-to-one, and many-to-many), which are often calledjoinsby database also perform sequential merges,which have no equivalent in the relational database for adding new variables from a second dataset to existing observations. You usemerge, for instance, when combining hospital patient and discharge datasets. If you wish to add newobservations to existing variables, then see [D]append. You useappend, for instance, when addingcurrent discharges to past link datasets in separate frames, you can use thefrlinkandfrgetcommands.
is the using matters only if there are overlapping variable names. 1:1 merges are less common than 1:m and m:1 merges. merge 1:m and merge m:1 specify one-to-many and many-to-one match merges, respectively. To illustrate the two choices, suppose you have a dataset containing information about individual hospitals, called hospitals.dta.
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