Scientific evidence

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Scientific evidence is evidence that serves to either support or counter a scientific theory or hypothesis,[1] although scientists also use evidence in other ways, such as when applying theories to practical problems.[2] Such evidence is expected to be empirical evidence and interpretable in accordance with scientific methods. Standards for scientific evidence vary according to the field of inquiry, but the strength of scientific evidence is generally based on the results of statistical analysis and the strength of scientific controls.[citation needed]

Principles of inference[edit]

A person's assumptions or beliefs about the relationship between observations and a hypothesis will affect whether that person takes the observations as evidence.[3] These assumptions or beliefs will also affect how a person utilizes the observations as evidence. For example, the Earth's apparent lack of motion may be taken as evidence for a geocentric cosmology. However, after sufficient evidence is presented for heliocentric cosmology and the apparent lack of motion is explained, the initial observation is strongly discounted as evidence.

When rational observers have different background beliefs, they may draw different conclusions from the same scientific evidence. For example, Priestley, working with phlogiston theory, explained his observations about the decomposition of mercuric oxide using phlogiston. In contrast, Lavoisier, developing the theory of elements, explained the same observations with reference to oxygen.[4] Note that a causal relationship between the observations and hypothesis does not exist to cause the observation to be taken as evidence,[3] but rather the causal relationship is provided by the person seeking to establish observations as evidence.

A more formal method to characterize the effect of background beliefs is Bayesian inference.[5] In Bayesian inference, beliefs are expressed as percentages indicating one's confidence in them. One starts from an initial probability (a prior), and then updates that probability using Bayes' theorem after observing evidence.[6] As a result, two independent observers of the same event will rationally arrive at different conclusions if their priors (previous observations that are also relevant to the conclusion) differ. However, if they are allowed to communicate with each other, they will end in agreement (per Aumann's agreement theorem).

The importance of background beliefs in the determination of what observations are evidence can be illustrated using deductive reasoning, such as syllogisms.[7] If either of the propositions is not accepted as true, the conclusion will not be accepted either.

Utility of scientific evidence[edit]

Philosophers, such as Karl R. Popper, have provided influential theories of the scientific method within which scientific evidence plays a central role.[8] In summary, Popper provides that a scientist creatively develops a theory that may be falsified by testing the theory against evidence or known facts. Popper's theory presents an asymmetry in that evidence can prove a theory wrong, by establishing facts that are inconsistent with the theory. In contrast, evidence cannot prove a theory correct because other evidence, yet to be discovered, may exist that is inconsistent with the theory.[9]

Philosophical versus scientific views[edit]

In the 20th century, many philosophers investigated the logical relationship between evidence statements and hypotheses, whereas scientists tended to focus on how data are generated.[10]: S193  But according to philosopher Deborah Mayo, by the end of the 20th century philosophers had come to understand that "there are key features of scientific practice that are overlooked or misdescribed by all such logical accounts of evidence, whether hypothetico-deductive, Bayesian, or instantiationist".[10]: S194 

There were a variety of 20th-century philosophical approaches to decide whether an observation may be considered evidence; many of these focused on the relationship between the evidence and the hypothesis. In the 1950s, Rudolf Carnap recommended distinguishing such approaches into three categories: classificatory (whether the evidence confirms the hypothesis), comparative (whether the evidence supports a first hypothesis more than an alternative hypothesis) or quantitative (the degree to which the evidence supports a hypothesis).[11] A 1983 anthology edited by Peter Achinstein provided a concise presentation by prominent philosophers on scientific evidence, including Carl Hempel (on the logic of confirmation), R. B. Braithwaite (on the structure of a scientific system), Norwood Russell Hanson (on the logic of discovery), Nelson Goodman (of grue fame, on a theory of projection), Rudolf Carnap (on the concept of confirming evidence), Wesley C. Salmon (on confirmation and relevance), and Clark Glymour (on relevant evidence).[12] In 1990, William Bechtel provided four factors (clarity of the data, replication by others, consistency with results arrived at by alternative methods, and consistency with plausible theories of mechanisms) that biologists used to settle controversies about procedures and reliability of evidence.[13]

In 2001, Achinstein published his own book on the subject titled The Book of Evidence, in which, among other topics, he distinguished between four concepts of evidence: epistemic-situation evidence (evidence relative to a given epistemic situation), subjective evidence (considered to be evidence by a particular person at a particular time), veridical evidence (a good reason to believe that a hypothesis is true), and potential evidence (a good reason to believe that a hypothesis is highly probable).[14] Achinstein defined all his concepts of evidence in terms of potential evidence, since any other kind of evidence must at least be potential evidence, and he argued that scientists mainly seek veridical evidence but they also use the other concepts of evidence, which rely on a distinctive concept of probability, and Achinstein contrasted this concept of probability with previous probabilistic theories of evidence such as Bayesian, Carnapian, and frequentist.[14]

Simplicity is one common philosophical criterion for scientific theories.[15] Based on the philosophical assumption of the strong Church-Turing thesis, a mathematical criterion for evaluation of evidence has been conjectured, with the criterion having a resemblance to the idea of Occam's razor that the simplest comprehensive description of the evidence is most likely correct.[16] It states formally, "The ideal principle states that the prior probability associated with the hypothesis should be given by the algorithmic universal probability, and the sum of the log universal probability of the model plus the log of the probability of the data given the model should be minimized."[16] However, some philosophers (including Richard Boyd, Mario Bunge, John D. Norton, and Elliott Sober) have adopted a skeptical or deflationary view of the role of simplicity in science, arguing in various ways that its importance has been overemphasized.[17]

Emphasis on hypothesis testing as the essence of science is prevalent among both scientists and philosophers.[18] However, philosophers have noted that testing hypotheses by confronting them with new evidence does not account for all the ways that scientists use evidence.[2] For example, when Geiger and Marsden scattered alpha particles through thin gold foil, the resulting data enabled their experimental adviser, Ernest Rutherford, to very accurately calculate the mass and size of an atomic nucleus for the first time.[19] Rutherford used the data to develop a new atomic model, not only to test an existing hypothesis; such use of evidence to produce new hypotheses is sometimes called abduction (following C. S. Peirce).[19] Social-science methodologist Donald T. Campbell, who emphasized hypothesis testing throughout his career, later increasingly emphasized that the essence of science is "not experimentation per se" but instead the iterative competition of "plausible rival hypotheses", a process that at any given phase may start from evidence or may start from hypothesis.[20] Other scientists and philosophers have emphasized the central role of questions and problems in the use of data and hypotheses.[21]

Concept of scientific proof[edit]

While the phrase "scientific proof" is often used in the popular media,[22] many scientists have argued that there is really no such thing. For example, Karl Popper once wrote that "In the empirical sciences, which alone can furnish us with information about the world we live in, proofs do not occur, if we mean by 'proof' an argument which establishes once and for ever the truth of a theory."[23][24] Albert Einstein said:

The scientific theorist is not to be envied. For Nature, or more precisely experiment, is an inexorable and not very friendly judge of his work. It never says "Yes" to a theory. In the most favorable cases it says "Maybe", and in the great majority of cases simply "No". If an experiment agrees with a theory it means for the latter "Maybe", and if it does not agree it means "No". Probably every theory will someday experience its "No"—most theories, soon after conception.[25]

See also[edit]

References[edit]

  1. ^ Taper, Mark L.; Lele, Subhash (2004). "The nature of scientific evidence: a forward-looking synthesis". In Taper, Mark L.; Lele, Subhash (eds.). The nature of scientific evidence: statistical, philosophical, and empirical considerations. Chicago: University of Chicago Press. pp. 527–551 (547). doi:10.7208/chicago/9780226789583.003.0016. ISBN 0226789551. OCLC 54461920. Scientific evidence is generally taken to be anything tending to refute or confirm a hypothesis.
  2. ^ a b Boyd, Nora Mills; Bogen, James (June 14, 2021). "Theory and observation in science". In Zalta, Edward N. (ed.). Stanford Encyclopedia of Philosophy. "Discussions about empirical evidence have tended to focus on epistemological questions regarding its role in theory testing ... even though empirical evidence also plays important and philosophically interesting roles in other areas including scientific discovery, the development of experimental tools and techniques, and the application of scientific theories to practical problems."
  3. ^ a b Longino, Helen (March 1979). Philosophy of Science, Vol. 46. pp. 37–42.
  4. ^ Thomas S. Kuhn, The Structure of Scientific Revolution, 2nd Ed. (1970).
  5. ^ William Talbott "Bayesian Epistemology" Accessed May 13, 2007.
  6. ^ Thomas Kelly "Evidence". Accessed May 13, 2007.
  7. ^ George Kenneth Stone, "Evidence in Science"(1966)
  8. ^ Karl R. Popper,"The Logic of Scientific Discovery" (1959).
  9. ^ Reference Manual on Scientific Evidence, 2nd Ed. (2000), p. 71. Accessed Feb 21, 2020. see: the 3rd edition of Reference Manual on Scientific Evidence
  10. ^ a b Mayo, Deborah G. (September 2000). "Experimental practice and an error statistical account of evidence". Philosophy of Science. 67 (Supplement): S193–S207. doi:10.1086/392819. JSTOR 188668. S2CID 61281250. A question regularly posed by scientists and philosophers of science is: When do empirical data provide a good test of, or reliable evidence for, a scientific hypothesis? Despite this shared interest, the considerations scientists appeal to in answering it are markedly different from those invoked in philosophical accounts of evidence and confirmation. Mayo's paper was part of the symposium "Evidence, data generation, and scientific practice: toward a reliabilist philosophy of experiment" at the 1998 biennial meetings of the Philosophy of Science Association. See also Achinstein's contribution to the symposium: Achinstein, Peter (2000). "Why philosophical theories of evidence are (and ought to be) ignored by scientists". Philosophy of Science. 67 (Supplement): S180–S192. doi:10.1086/392818. JSTOR 188667. S2CID 120774584.
  11. ^ Carnap, Rudolf (1962) [1950]. Logical foundations of probability (2nd ed.). Chicago: University of Chicago Press. p. 462. ISBN 9780226093437. OCLC 372957.
  12. ^ Achinstein, Peter, ed. (1983). The concept of evidence. Oxford readings in philosophy. Oxford; New York: Oxford University Press. ISBN 0198750625.
  13. ^ Bechtel, William (1990). "Scientific evidence: creating and evaluating experimental instruments and research techniques". PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association. 1990 (1): 559–572 (561). doi:10.1086/psaprocbienmeetp.1990.1.192732. JSTOR 192732. S2CID 62119768.
  14. ^ a b McArthur, Dan (August 2003). "Book review: Peter Achinstein, The book of evidence". Philosophy in Review. 23 (4): 235–237. Achinstein's four concepts are also summarized in: Achinstein, Peter (2014) [2008]. "Evidence". In Curd, Martin; Psillos, Stathis (eds.). The Routledge companion to philosophy of science. Routledge philosophy companions (2nd ed.). London; New York: Routledge. pp. 381–392. doi:10.4324/9780203744857. ISBN 9780415518741. OCLC 824535995.
  15. ^ Baker, Alan (20 December 2016). "Simplicity". In Zalta, Edward N. (ed.). Stanford Encyclopedia of Philosophy.
  16. ^ a b Vitányi, Paul M. B.; Li, Ming (March 2000). "Minimum description length induction, Bayesianism, and Kolmogorov complexity" (PDF). IEEE Transactions on Information Theory. 46 (2): 446–464. arXiv:cs/9901014. doi:10.1109/18.825807. S2CID 5971084. See also Chapter 5 in: Li, Ming; Vitányi, Paul (2019). An introduction to Kolmogorov complexity and its applications. Texts in computer science (4th ed.). Cham: Springer-Verlag. doi:10.1007/978-3-030-11298-1. ISBN 9783030112974. OCLC 1106165074. S2CID 184483493.
  17. ^ Fitzpatrick, Simon (2013). "Simplicity in the philosophy of science". Internet Encyclopedia of Philosophy. See especially Sections 1b and 4c.
  18. ^ For example: Schindler, Samuel (2018). "Testability and non–ad hocness". Theoretical virtues in science: uncovering reality through theory. Cambridge, UK; New York: Cambridge University Press. pp. 6–7. doi:10.1017/9781108381352. ISBN 9781108422260. No other criterion of a good scientific theory is as widely recognized as the falsifiability or testability of a theory—not only within the philosophy of science, but also way beyond it. And: "Understanding Science 101: Testing scientific ideas". undsci.berkeley.edu. University of California Museum of Paleontology. Testing hypotheses and theories is at the core of the process of science.
  19. ^ a b Thagard, Paul; Toombs, Ethan (2005). "Atoms, categorization and conceptual change" (PDF). In Cohen, Henri; Lefebvre, Claire (eds.). Handbook of categorization in cognitive science. Amsterdam: Elsevier. pp. 243–254 (253). doi:10.1016/B978-008044612-7/50065-2. ISBN 0080446124. OCLC 60667797. The features of abductive prototypes are hypothesized in order to explain observations, as when Rutherford inferred that the mass of an atom is concentrated in a very small region in order to explain why alpha particles pass through gold foil. Abductive prototypes can change dramatically when new data require revision of hypotheses concerning explanatory features. This is just what happened to the concept of an atom when the experiments of Thompson and Rutherford revealed the divisibility of atoms. Rutherford's interpretation of the Geiger–Marsden experiment is also mentioned as an example of abduction in: Faye, Jan (2014). "On interpretation". The nature of scientific thinking: on interpretation, explanation, and understanding. Houndmills, Basingstoke, Hampshire; New York: Palgrave Macmillan. pp. 60–84. doi:10.1057/9781137389831_3. ISBN 9781137389824. OCLC 870285649.
  20. ^ Campbell, Donald T. (1984) "Foreword". In Yin, Robert K. (2018) [1984]. Case study research: design and methods (6th ed.). Los Angeles: Sage Publications. pp. xiii–xiv. ISBN 9781506336169. OCLC 983826254. More and more I have come to the conclusion that the core of the scientific method is not experimentation per se but rather the strategy connoted by the phrase 'plausible rival hypotheses'. This strategy may start its puzzle solving with evidence, or it may start with hypothesis. Rather than presenting this hypothesis or evidence in the context-independent manner of positivistic confirmation (or even of postpositivistic corroboration), it is presented instead in extended networks of implications that (although never complete) are nonetheless crucial to its scientific evaluation. This strategy includes making explicit other implications of the hypothesis for other available data and reporting how these fit. It also includes seeking out rival explanations of the focal evidence and examining their plausibility. The plausibility of these rivals is usually reduced by ramification extinction, that is, by looking at their other implications on other data sets and seeing how well these fit. This idea is further discussed in several chapters in: Bickman, Leonard, ed. (2000). Donald Campbell's legacy. Thousand Oaks, CA: Sage Publications. OCLC 42603382.
  21. ^ For example: "Thematic issue: Scientific method as a problem-solving and question-answering technique: Vol. 47, No. 1 of Synthese". April 1981. One article from the issue is: Nickles, Thomas (April 1981). "What is a problem that we may solve it?". Synthese. 47 (1): 85–118. doi:10.1007/BF01064267. JSTOR 20115620. S2CID 46982553. Data sometimes do not constitute the problem (or the primary problem) but serve chiefly as evidence that a problem (or at least a deeper problem) exists. See also: Nickles, Thomas (1988). "Questioning and problems in philosophy of science: problem-solving versus directly truth-seeking epistemologies". In Meyer, Michel (ed.). Questions and questioning. Grundlagen der Kommunikation = Foundations of communication. Berlin; New York: De Gruyter. pp. 43–67. doi:10.1515/9783110864205.43. ISBN 3110106809. And from a scientist's perspective: Krauss, Lawrence M. (14 May 2015). "The big unanswered questions". The Huffington Post. Retrieved 15 May 2015.
  22. ^ See, for example, "Greenpeace co-founder: No scientific proof humans are dominant cause of warming climate". Fox News Channel. 28 February 2014. Retrieved 19 March 2014.
  23. ^ Popper, Karl (2011) [1966]. The Open Society and Its Enemies (5th ed.). Routledge. pp. 229–230. ISBN 9781136700323.
  24. ^ Theobald, Douglas (1999–2012). "29+ Evidences for Macroevolution". TalkOrigins Archive. Retrieved 19 March 2014.
  25. ^ Gaither, Carl (2009). Gaither's Dictionary of Scientific Quotations. New York, NY: Springer. p. 1602. ISBN 978-0-387-49575-0.