Common biases

3. Adopting beliefs or behaviors because others are doing so.
5. Favoring members of one’s own group over outsiders.
8. Focusing more on negative events or information than positive ones.
12. Overestimating one’s abilities, knowledge, or the accuracy of one’s predictions.
14. Focusing on successful cases while overlooking failures.
15. Giving undue weight to recent events compared to earlier ones.

1. People with low ability overestimating their competence, while experts underestimate their expertise.
2. The tendency to search for, interpret, and remember information that confirms preexisting beliefs.
4. Relying too heavily on the first piece of information encountered (the "anchor") when making decisions.
6. Overestimating the likelihood of events based on how easily they come to mind.
7. Continuing an endeavor due to previously invested resources, even when it’s no longer rational.
9. Believing, after an event has occurred, that the outcome was predictable.
10. Being influenced by how information is presented rather than the information itself.
11. Allowing an overall impression of someone to influence judgments about unrelated traits.
13. The tendency to prefer avoiding losses rather than acquiring equivalent gains.