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“These chemicals are largely unknown,” said David Bellinger, a professor at the Harvard University School of P The post also explains the problem of ''heathy user bias''. For illustration, it cites a 2009 study that found that patients w ...

...ing vote as a Pennsylvania Democrat whose party affiliation was listed as "unknown" in one of the voting databases and erroneously wound up in Republican coun ...he sampling distribution of the mean and other statistics from built-in or user-defined distributions. [From the larger project Online Statistics Educatio ...

“Clearly, any product with a large user base is going to throw up some problems. Dell, for example, is shipping al ...rveys that polled national samples about similarly fictitious or otherwise unknown legislation, [pollsters] found 20 to 40 percent of Americans were willing t ...