This is a preview. Log in through your library . Abstract Sample surveys are used to investigate occurrence and determinants of diseases in populations. Their reliability is influenced by quality of ...

One possible explanation for the variability in estimates across the different nonprobability samples is the range of methods that online sample vendors employ. They differ on recruitment, weighting ...

The study of hard-to-reach populations presents significant challenges. Typically, a sampling frame is not available, and population members are difficult to identify or recruit from broader sampling ...

The data in this report is drawn from a national cross-sectional survey conducted for Pew Research Center by Westat. The sampling design of the survey was an address-based sampling (ABS) approach, ...

In a September 28, 2018 Change Request to Medicare’s Program Integrity Manual (“PIM”), the Centers for Medicare & Medicaid Services (“CMS”) updated its instructions to Medicare contractors regarding ...

— -- ABC News polls of the general population are conducted by telephone among a random national sample of adults age 18 and over. Sampling and data collection for most of these polls is ...

NEW YORK--(BUSINESS WIRE)--GfK has named Mansour Fahimi, Ph.D., as Senior Vice President of Sampling Statistics, signaling the company’s continued commitment to the highest standards in online ...