Method of Combining
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Illustration
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One-to-one reading
Creates observations
that contain all of the variables from each contributing data set.
Combines observations
based on their relative position in each data set.
Statement: SET
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Concatenating
Appends the observations
from one data set to another.
Statement: SET
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Appending
Adds the observations
in the second data set directly to the end of the original data set.
Procedure: APPEND
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Interleaving
Intersperses observations
in order from two or more data sets, based on one or more common variables.
Statements: SET, BY
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Match-merging
Matches observations
from two or more data sets into a single observation in a new data
set according to the values of a common variable.
Statements: MERGE, BY
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