While the capacity to predetermine the demographic profile of the sample is common in nonprobability web surveys ... higher estimated shares of adults identifying as Democrats than was found in an ...

Throughout its history, the Pew Research Center has periodically conducted major surveys that take an in-depth look at important ... it is a nationally representative, probability sample. Consistent ...

U.S.A.I.D. Advertisement Supported by The Demographic and ... what might happen to the research that has been collected over past decades, or to the ongoing survey projects in 25 countries.