Post hoc ergo propter hoc
Fallacy of assumption of causation based on sequence of events
Fallacy of assumption of causation based on sequence of events
Post hoc ergo propter hoc (Latin: 'after this, therefore because of this') is an informal fallacy that states "Because event Y followed event X, event Y must have been caused by event X". It is a fallacy in which an event is presumed to have been caused by a closely preceding event merely on the grounds of temporal succession. This type of reasoning is fallacious because mere temporal succession does not establish a causal connection. It is often shortened simply to post hoc fallacy. A logical fallacy of the questionable cause variety, it is subtly different from the fallacy cum hoc ergo propter hoc ('with this, therefore because of this'), in which two events occur simultaneously or the chronological ordering is insignificant or unknown. Post hoc ergo propter hoc is a logical fallacy in which one event is interpreted to be the cause of a later event because it occurred earlier. Post hoc ergo propter hoc is a particularly tempting error because correlation sometimes appears to suggest causality...
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