were more likely to be created when the groups were Group A and B, as compared to students of the class of 1993 or the class of 1994. See also Apophenia Clustering illusion Cognitive bias Confirmation bias Cum hoc ergo propter hoc Observer bias Observer-expectancy effect Pareidolia Post hoc ergo propter hoc Radical behaviorism Subject-expectancy effect Superstition Thin-slicing Type I error Spurious relationship References Notes Sources Cognitive biases