YouGov/The Economist National Poll: Warren 26% (+1), Biden 23% (-3), Sanders 17% (+3)

[Celerity]

14. you repeat the same bollocks on every poll you do not like the results of, with intent to cast doubt

Every online poll works off of a large sample, a pre-determined group, and so many (such as the 'beloved by Biden folks' HarrisX) offer a small incentive for replying. YouGov has a sample base of more than 10,000 off which they use highly sophisticated weighting mechanisms to get an accurate sample.


https://www.nytimes.com/2019/07/02/upshot/online-polls-analyzing-reliability.html

snip

The online samples that fared well raise some concerns about the other online pollsters, if only by implication. YouGov, for instance, consistently fared best in the Pew test in part by using a distinctively sophisticated method of sample selection, called synthetic sampling. YouGov selects individuals from its panel of respondents, one by one, to match the demographic profile of individual Americans and thus match the country’s demographics as a whole.

snip

Those that did had decent but not exceptional results. On average, online polls had an error of 5.3 percentage points in 2018 — a tally very close to their average error in 2016 and 2017, as reported by FiveThirtyEight.

YouGov, it should be noted, posted an impressive 2.5-point average error in its final 2018 polls; no other online-only firm had an average error beneath five points.