self-selection bias
Sign in to savesituation in which individuals select themselves into a group, causing a biased sample with nonprobability sampling
In the Vinony graph
Vinony's link graph records 205 inbound references to self-selection bias, and connects out to sampling bias, psychology and economics.
Vinony files it under Bias, Design of experiments and Sampling (statistics).
Vinony links it to 8 Wikipedia language editions.