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Explanatory power : ウィキペディア英語版
Explanatory power
:''This article deals with explanatory power in the context of the philosophy of science. For a statistical measure of explanatory power, see Coefficient of determination.''
Explanatory power is the ability of a hypothesis or theory to effectively explain the subject matter it pertains to. The opposite of explanatory power is ''explanatory impotence''.
In the past, various criteria or measures for explanatory power have been proposed. In particular, one hypothesis, theory or explanation can be said to have more explanatory power than another about the same subject matter
- if more facts or observations are accounted for;
- if it changes more "surprising facts" into "a matter of course" (following Peirce);
- if more details of causal relations are provided, leading to a high accuracy and precision of the description;
- if it offers greater predictive power, i.e., if it offers more details about what we should expect to see, and what we should not;
- if it depends less on authorities and more on observations;
- if it makes fewer assumptions;
- if it is more falsifiable, i.e., more testable by observation or experiment (following Popper).
Recently, David Deutsch proposed that the ''correct'' hypothesis or theory, the one that stands out among all possible explanations, is that specific explanation that
- is ''hard to vary''.
By this expression he intends to state that the correct theory, i.e., the true explanation, provides specific details which fit together so tightly that it is impossible to change any one detail without affecting the whole theory.
==Introduction==
Philosopher and physicist David Deutsch offers a criterion for a good explanation that he says may be just as important to scientific progress as learning to reject appeals to authority, and adopting formal empiricism and falsifiability. To Deutsch, these aspects of a good explanation, and more, are contained in any theory that is specific and "hard to vary". He believes that this criterion helps eliminate "bad explanations" which continuously add justifications, and can otherwise avoid ever being truly falsified.〔(David Deutsch, "A new way of explaining explanation" )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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