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Wedberg Lectures

Wedberg Lectures
Stockholm University

The Material Theory of Induction


Tuesday, March 10 - Thursday, March 12, 2020

John D. Norton
Distinguished Professor
Department of History and Philosophy of Science
University of Pittsburgh
http://www.pitt.edu/~jdnorton

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Lecture website at Stockholm University

Accounts of inductive inference are modeled on those of deductive inference. They seek to separate the good inductive inferences from the bad by checking whether some candidate inference conforms to a universally applicable schema or template. This approach has worked well enough for deductive inference and has delivered a sizable collection of uncontroversial deductive logics. The approach has failed for inductive inference. Millennia after inductive inference was first explored systemically in Ancient Greece, we still have no general agreement on which are the good inductive inferences.

The material theory of inductive inference offers an alternative approach. Instead of looking to universal formal templates to warrant inductive inferences, it locates that warrant in facts. Efforts to check whether an inductive inference is good terminate in the display of background facts whose meaning warrants the inference. There are no universally applicable warranting facts for inductive inferences. There is, for example, no factual principle of uniformity of nature. Instead warranting facts are specific facts in the various domains of application of inductive inference. If follows that, in so far as we can find schema for inductive inference, they have local applicability only. "All induction is local."


Galileo fall

Lecture 1. The Material Theory of Induction, Introduced

Tuesday March 10
13.00-15.00 in Bergsmannen (Aula Magna)

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A general argument for the material theory of induction is given: since inductive inferences amplify the factual content of their premises, they can only succeed in domains hospitable to them. That the domain is hospitable is a fact about the domain that warrants the inference. The approach will be motivated by considering an inductive inference made by Marie Curie on the crystalline form of radium chloride; and by a second less obvious inductive inference.

Reading

Material Theory Book

The Material Theory of Induction
Ch. 1 The Material Theory of Induction Stated and Illustrated
Ch. 2 What Powers Induction Inference?



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Lecture 2. Analogy, Abduction and Simplicity

Wednesday March 11
13.00-15.00 in Bergsmannen (Aula Magna)

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The material theory of induction is capable of recovering the successes of various competing accounts of inductive inference while avoiding their weaknesses. This recovery is illustrated in the cases of inductive arguments based on analogy, abduction and simplicity. Attempts at formal accounts of each have failed to provide us with serviceable templates for each that can be applied mechanically. The apparent successes of these forms of inductive inference are shown to derive from specific background facts peculiar to their domains of application.

Reading

Material Theory Book

The Material Theory of Induction
Ch. 4 Analogy
Ch. 6 Simplicity as a Surrogate.
Ch. 8. Inference to the Best Explanation: The General Account
Ch. 9. Inference to the Best Explanation: Examples




roulette chance

Lecture 3. Why Not Bayes

Thursday March 12
13.00-15.00 in Bergsmannen (Aula Magna)

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In domains where it is warranted, Bayesian analysis is powerful and effective. However Bayesian analysis, like all formal approaches to inductive inference, cannot be applied in all domains. Whether it is applicable cannot be presumed as a default. Rather we have a positive obligation to show that Bayesian analysis is applicable in each new domain. Symmetry considerations preclude Bayesian analysis from domains in which evidence is completely neutral and when applied to an idealized infinite lottery machine. Arguments purporting to show the universal applicability of Bayesian analysis are circular. For they are deductive. That is, they must proceed from assumptions that must be logically at least as strong as the conclusion sought.

Reading

Material Theory Book

The Material Theory of Induction
Ch. 10 Why Not Bayes
Ch. 11 Circularity in the Scoring Rule Vindication of Probabilities
Ch. 12 No Place to Stand: The Incompleteness of All Calculi of Inductive Inference
Ch. 13 Infinite Lottery Machines


Further Readings

John D. Norton, collected papers on the Material theory of induction