Sas variable updating

17-Apr-2015 22:29

Then the results of the DATA step will overwrite the old data set named in the SET statement.The SET statement with two or more data sets, in addition to reading and modifying the data, concatenates or stacks the data sets one on top of the other.All you need to do is the following: When you want to match observations from one data set with observations from another, use the MERGE statement in the DATA step.

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If you don't want to create a new data set, you can specify the same name in the DATA and SET statements.

But, you will typically need a common variable or several variables which taken together uniquely identify each observation.

In other words, having a common variable to merge by ensures that the observations are properly matched.

If the data are not already sorted, use PROC SORT to sort all data sets by the common variables.

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This is useful when you want to combine data sets with all or most of the same variables but different observations.You might, for example, have data taken at two separate times, but you need the data together for analysis.

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