What is the unique identifier in NHANES data that we need to append or merge data by?
In NHANES, each sampled person is identified by a unique sequence number, and the variable name for it is SEQN. Every time you extract variables from an NHANES data file, you should always include the SEQN variable in your selection. The SEQN will later be used for sorting the data, and for appending and merging the data files.
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