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The fallacy of composition is an informal fallacy that arises when one infers that something is true of the whole from the fact that it is true of some part of the whole. A trivial example might be: "This tire is made of rubber; therefore, the vehicle of which it is a part is also made of rubber."
Hasty generalization (fallacy of insufficient statistics, fallacy of insufficient sample, fallacy of the lonely fact, hasty induction, secundum quid, converse accident, jumping to conclusions) – basing a broad conclusion on a small or unrepresentative sample.
Hasty generalization is the fallacy of examining just one or very few examples or studying a single case and generalizing that to be representative of the whole class of objects or phenomena. The opposite, slothful induction , is the fallacy of denying the logical conclusion of an inductive argument, dismissing an effect as "just a coincidence ...
Hasty generalization often follows a pattern such as: X is true for A. X is true for B. Therefore, X is true for C, D, etc. While never a valid logical deduction, if such an inference can be made on statistical grounds, it may nonetheless be convincing. This is because with enough empirical evidence, the generalization is no longer a hasty one.
[12] [24] The fallacy of composition is committed if one infers from the fact that each member of a group has a property that the group as a whole has this property. [24] For example, "[e]very member of the investigative team was an excellent researcher", therefore "[i]t was an excellent investigative team". [3]
hasty generalization An informal fallacy in which a conclusion is not logically justified by sufficient or unbiased evidence; drawing a general conclusion from a too-small sample size. Henkin semantics A generalization of standard first-order semantics that allows for models where the range of quantifiers can be restricted, named after Leon Henkin.
Both the fallacy of division and the fallacy of composition were addressed by Aristotle in Sophistical Refutations.. In the philosophy of the ancient Greek Anaxagoras, as claimed by the Roman atomist Lucretius, [6] it was assumed that the atoms constituting a substance must themselves have the salient observed properties of that substance: so atoms of water would be wet, atoms of iron would be ...
An argument from anecdote is an informal logical fallacy, when an anecdote is used to draw an improper logical conclusion.The fallacy can take many forms, such as cherry picking, hasty generalization, proof by assertion, and so on.