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 ...

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 ...

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, ...