Biases drastically skew the reliability of anecdotal and legal evidence.

As a human being, I’m proud to say I have biases. Having biases is what separates me from the machines I live with. Although it is debatable, I tend to believe that biases serve a useful purpose – to some degree. Knowing I have biases helps me communicate, make choices, respond, and live with far less stress.

To believe you are unbiased is to say you are inhuman or a machine. Admitting your biases helps you take charge of them. And in taking charge of your biases you can take charge of your life. Further, in understanding your biases and how they work you become a more useful and stress-free member of your society.

In this article, I have copied liberally from Wikipedia, the free encyclopedia. As you read the list of cognitive biases along with their variants, I hope you, too, will find some value. Maybe you’ll notice some biases you didn’t know you had. You can’t truly gauge any of the biases you might be operating under since it’s not possible to accurately observe a system of which you’re a part. Still, you may be able to note biases you see in others and by association assign them to yourself – and maybe notice how you might operate the same bias you see in another.

Remember: knowing you have biases helps you take charge of them. Understanding how your biases work helps you understand yourself and others better. This understanding can serve you and your community in a number of ways.

Cognitive Bias

A cognitive bias is any of a wide range of observer effects identified in cognitive science and social psychology including very basic statistical, social attribution, and memory errors that are common to all human beings. Biases drastically skew the reliability of anecdotal and legal evidence. Social biases, usually called attributional biases, affect our everyday social interactions. And biases related to probability and decision making significantly affect the scientific method which is deliberately designed to minimize such bias from any one observer.

List of Cognitive Biases

1. Bandwagon effect – the tendency to do (or believe) things because many other people do (or believe) the same.
2. Bias blind spot – the tendency not to compensate for one’s own cognitive biases.
3. Choice-supportive bias – Choice-supportive bias – the tendency to justify one’s past choices with positive attributes that may or may not have existed at the time the choice was made.
4. Confirmation bias – the tendency to search for or interpret information in a way that confirms one’s preconceptions.
5. Congruence bias – the tendency to test hypotheses exclusively through direct testing, in contrast to tests of possible alternative hypotheses.
6. Contrast effect – the enhancement or diminishment of a weight or other measurement when compared with recently observed contrasting object.
7. Deformation professionnelle – the tendency to look at things according to the conventions of one’s own profession, forgetting any broader point of view.
8. Disconfirmation bias – the tendency for people to extend critical scrutiny to information which contradicts their prior beliefs and uncritically accept information that is congruent with their prior beliefs.
9. Endowment effect – the tendency to place a higher value on objects one owns relative to objects they do not.
10. Fundamental attribution error is the tendency for people to over-emphasize personality-based explanations for behaviors observed in others while under-emphasizing the role and power of situational influences on the same behavior.
11. Focusing effect – prediction bias occurring when people place too much importance on one aspect of an event; causes error in accurately predicting the utility of a future outcome.
12. Hyperbolic discounting – the tendency for people to have a stronger preference for more immediate payoffs relative to later payoffs, the closer to the present both payoffs are.
13. Hindsight bias, sometimes called the “I-knew-it-all-along” effect, is the inclination to see past events as being predictable.
14. Illusion of control – the tendency for human beings to believe they can control or at least influence outcomes that they clearly cannot.
15. Impact bias – the tendency for people to overestimate the length or the intensity of the impact of future feeling states.
16. Information bias – the tendency to seek information even when it cannot affect action.
17. Loss aversion – the tendency for people strongly to prefer avoiding losses than acquiring gains. Some studies suggest that losses are as much as twice as psychologically powerful as gains.
18. Neglect of probability – the tendency to completely disregard probability when making a decision under uncertainty.
19. Mere exposure effect – the tendency for people to express undue liking for things merely because they are familiar with them.
20. Omission bias – The tendency to judge harmful actions as worse, or less moral, than equally harmful omissions (inactions).
21. Outcome bias – the tendency to judge a past decision by incorporating presently available information.
22. Planning fallacy – the tendency to underestimate task-completion times.
23. Post-purchase rationalization – the tendency to persuade oneself through rational argument that a purchase was a good value.
24. Pseudocertainty effect – the tendency to make risk-averse choices if the expected outcome is positive, but make risk-seeking choices to avoid negative outcomes.
25. Reactance – the urge to do the opposite of what someone wants you to do out of a need to reassert a perceived attempt to constrain your freedom of choice.
26. Selective perception – the tendency for expectations to affect perception.
27. Self-serving bias is the tendency to claim more responsibility for successes than failures. It may also manifest itself as a tendency for people to evaluate ambiguous information in a way beneficial to their interests.
28. Status quo bias – the tendency for people to like things to stay relatively the same.
29. Von Restorff effect – the tendency for an item that “stands out like a sore thumb” to be more likely to be remembered than other items.
30. Zero-risk bias – preference for reducing a small risk to zero over a greater reduction in a larger risk.