Next to each questionnaire section, laboratory component, or exam component on the NHANES 2001-2002 data page there are links that appear as follows: [Codebook, Doc, Freqs, Data]. What are these links for?
These links allow you to view the codebook, documentation, or file frequencies online rather than having to download the entire self-extracting zip file. The codebook and documentation are in PDF format so you should be able to view these directly in your browser if configured with Adobe Acrobat. The corresponding ‘freqs’ file contains the frequency distribution for each item in a particular data file. This can be used to verify the sample size for any particular data item.
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