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Projection bias is a feature in human thinking where one thinks that others have the same priority, attitude or belief that one harbours oneself, even if this is unlikely to be the case.
The concept of Projection Bias is different to that of psychological projection in which one thinks that others have a mental state one is unaware of having oneself.
A common example of projection bias is predicting that one's own views will stay the same over time. This has been shown to be statistically unlikely.