Where no disciplinary, institutional, or generalist data or sample repository or archive exists for collected original data and sample types, the PI is required to identify a preservation plan in a ...

ABOUT PEW RESEARCH CENTER Pew Research Center is a nonpartisan, nonadvocacy fact tank that informs the public about the issues, attitudes and trends shaping the world.It does not take policy positions ...

Two studies that compared weighted and unweighted estimates from online opt-in samples found that in many instances, demographic weighting only minimally reduced bias, and in some cases actually made ...