That is likely to lead to a significant statistical bias.

ECONOMIST: Political polls

They are irrelevant because they are all dwarfed by another bias (for which there is no life-saving cure available in any of the statistical packages): publication bias.

FORBES: Publication Bias (or, Why You Can't Trust Any of the Research You Read)

Advocacy groups offer studies, but as DAY TO DAY's Mike Pesca reports, whether these statistical reports on hate and bias are about anti-Semitic or anti-Muslim or anti-gay crimes, they often have one thing in common: dubious methodology.

NPR: Fudging the Numbers on Hate Crimes

At medical schools, pharma companies, and even at the FDA, biostatisticians and clinical researchers recognize that retrospective data when treated with appropriate bias-controlling statistical methods, can in fact be reliable, particularly as it points to direction of influence and the general magnitude of effect.

FORBES: Why The New Dendreon Analysis Does Matter -- And Why It Doesn't

Of course, I mean bias here in a strictly statistical sense and not in any sociological or psychological sense.

FORBES: ADP Benchmark Revision Adds Over 600K Private Sector Jobs

They treat horrifying statistical conditions such as unobserved heterogeneity, selection bias, heteroscedasticity, and autocorrelation.

FORBES: Publication Bias (or, Why You Can't Trust Any of the Research You Read)

Hence, publication bias vastly dominates any of the statistical biases we get so worked up about, making them pretty much irrelevant.

FORBES: Publication Bias (or, Why You Can't Trust Any of the Research You Read)