Note: This report was updated on Dec. 30, 2015 to reflect the January-July 2015 National Health Interview Survey estimates released on December 1, 2015. Telephone surveys face numerous challenges, but ...

Survey Basics Online Surveys Telephone Surveys Voter Files International Survey Methods We often hear a candidate is leading, trailing, or the race is tied. This is based on “horse race” polling, ...

Rotating Random Number Sampling is proposed as a flexible method to evenly distribute survey burden caused by a set of business surveys over enterprises without requiring aligned stratifications. The ...