Cycling and Self-Selection Bias

The Mail on Sunday reports on a self-selecting survey.

A Mail on Sunday article starts a headline with:

We will ditch Boris Johnson over bike lanes, say 27 percent of Tory voters

The claim derives from a self-selecting survey, run by FairFuelUK. The questions are likely to be leading for respondents. Recent surveys suggest around 2% of GB adults think transport is an important issue.

Self-selection bias