The following note should be added to the codebook documentation for V000087a (alph county name):
NOTE: This variable was constructed for use in Post-Election question C3 (variable V001243) which attempts to ascertain registration location. It should be noted that, although county identification in this variable for face-to-face interviews meets normal standards for accuracy, V000087a data for RDD cases were created by imputing area code, central office codes and similar listed numbers. This method of imputation has a certain amount of error, and for RDD cases V000087a (and corresponding FIPS codes which can also be made available to users in temporary variable V000087t) should not be considered as satisfying ANES standards. It is the intention of NES staff to provide accurate data for county identification of RDD cases in an additional forthcoming variable.