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*1.2) Separate linking variables from program data. Use the SAS system row number (_N_) to create a. new unique ID. Rename key variables to common names to make merging easier; *1.2a Create BirthIDs dataset containing all variables to be used for linkage; data MCH.BirthIDs; set MCH.Birthlink; Birth_ID = _N_; MomMaiden = Birth_Mom_Maiden; ................
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