Friday, July 20, 2007

Sampling Error Computations

The two variables needed to correctly estimate sampling error (SESTRAT and SECLUSTR) were inadvertently left off the individual data files for each of the three CPES studies. Until these are added back in, users can simply download the merged CPES file (where these variables are present) and then subset the file. For users who want only NCS-R, the file can be subset using the project identification variable CPESPROJ = 1; for users only wanting NLAAS, use CPESPROJ = 2; for users wanting NSAL, use CPESPROJ = 3. Please also refer to section VII. Sampling Error Computation Models in the Users Guide for additional information.

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