(also known as: clustering illusion)
Description: Ignoring the difference while focusing on the similarities, thus coming to an inaccurate conclusion. Similar to the gambler’s fallacy, this is an example of inserting meaning into randomness. This is also similar to the post-designation fallacy.
Example #1: The “prophet” Nostradamus wrote about 500 years ago:
Beasts wild with hunger will cross the rivers,
The greater part of the battle will be against Hister.
He will cause great men to be dragged in a cage of iron,
When the son of Germany obeys no law.
Surely he must have had some vision of Hitler!
Explanation: When you focus on just that prediction, then it might seem that way, but realize that Nostradamus made over 1000 “predictions”, most (all?) of which are vague nonsense. Given that many predictions, it is statistically impossible NOT to match at least one with an actual event. Again, if you ignore the noise (the predictions that do not make any sense), it looks amazing. By the way, “Hister” is the Latin name for the Danube River.
SuperCyberDate.con determined that Sally and Billy are a great match because they both like pizza, movies, junk food, Janet Jackson, and vote republican.
Explanation: What SuperCyberDate.con did not take into consideration were the 245 other likes and dislikes that were very different for both Sally and Billy—such as the fact that Billy is gay.
Exception: It's never a good idea to ignore the differences in the data while only focusing on the similarities.
Logically Fallacious is one of the most comprehensive collections of logical fallacies with all original examples and easy to understand descriptions; perfect for educators, debaters, or anyone who wants to improve his or her reasoning skills.
Get the book, Logically Fallacious by Bo Bennett, PhD by selecting one of the following options:
Enroll in the Mastering Logical Fallacies Online Course. Over 10 hours of video and interactive learning. Go beyond the book!
Enroll in the Fallacy-A-Day Passive Course. Sit back and learn fallacies the easy way—in just a few minutes per day, via e-mail delivery.
Have a podcast or know someone who does? Putting on a conference? Dr. Bennett is available for interviews and public speaking events. Contact him directly here.