A person whose decision is based on the perception of his or her own abilities rather than the facts at hand may be prone to bias. It is common for someone to view his or her own performance as better than that shown by someone else.
Predicted vs Actual Performance
Bias
overestimated
ego bias
correctly estimated
no bias
underestimated
reverse ego bias
This effect may be affected by:
(1) the person's level of experience. A naïve person may judge his or her own abilities less accurately than someone who is experienced.
(2) the person's feelings of superiority or feelings of inferiority
(3) the person's need to feel or appear to be in control (sense of adequacy)
(4) the person's level of pessimism vs optimism
Examples:
(1) expected performance for someone of a different race, gender or social class
(2) expected performance based on size, location or reputation
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