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Encyclopedia > Null result

Generally, a null result is a result which is null (nothing): that is, the proposed result is absent.[1] In science, it is an experimental outcome which does not show an otherwise expected effect. This does not imply a result of zero or nothing, simply a result that does not support the hypothesis. The term is a translation of the scientific Latin nullus resultarum, roughly meaning "none as a consequence". Look up null in Wiktionary, the free dictionary. ... Look up Hypothesis in Wiktionary, the free dictionary. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ...

Contents

Statistics

In statistics, specifically, a null result occurs when there are non-significant differences between experimental and control conditions. While some differences may in fact be observed, they are below the threshold set prior to testing for rejection of the null hypothesis. The cutoff for these significance values varies, but is often .05. A graph of a normal bell curve showing statistics used in educational assessment and comparing various grading methods. ... In statistics, a null hypothesis is a hypothesis set up to be nullified or refuted in order to support an alternative hypothesis. ...


Physics

In physics, the results of the Michelson-Morley experiment (MMX) were of this type, as it did not detect the expected velocity relative to the postulated luminiferous aether. This experiment's famous failed detection, commonly referred to as the null result, contributed to the development of Special relativity. Note that the MMX did in fact appear to measure a non-zero "drift", but the value was far too small to account for the theoretically expected results; it is generally thought to be inside the noise level of the experiment. This article needs additional references or sources for verification. ... The Michelson-Morley experiment, one of the most important and famous experiments in the history of physics, was performed in 1887 by Albert Michelson and Edward Morley at what is now Case Western Reserve University, and is considered by some to be the first strong evidence against the theory of... The luminiferous aether: it was hypothesised that the Earth moves through a medium of aether that carries light In the late 19th century luminiferous aether (light-bearing aether) was the term used to describe a medium for the propagation of light. ... The special theory of relativity was proposed in 1905 by Albert Einstein in his article On the Electrodynamics of Moving Bodies. Some three centuries earlier, Galileos principle of relativity had stated that all uniform motion was relative, and that there was no absolute and well-defined state of rest... In telecommunication, noise level is the noise power, usually relative to a reference. ...


Logic

In logic, a null result is an invalid value of a proposition. It is one of the possibilities in a three-valued logic (true, false, or null result). Logic (from Classical Greek λόγος logos; meaning word, thought, idea, argument, account, reason, or principle) is the study of the principles and criteria of valid inference and demonstration. ... Multi-valued logics are logical calculi in which there are more than two possible truth values. ...


Law

In law, a null result is something lacking any legal or binding force. See Null and void. Lady Justice or Justitia is a personification of the moral force that underlies the legal system (particularly in Western art). ... Look up Agreement in Wiktionary, the free dictionary An agreement may be an agreement in beliefs, rules, practices (policies), or conduct. ... Null and Void was a comedy television show that ran on UUTV (later called HillTV), the student-run television station at Syracuse University in New York. ...


External links

  • Role of the Michelson-Morley experiments in making determinations about competing theories
  • modern example: Neutrino oscillation null result

  Results from FactBites:
 
Null result - definition of Null result in Encyclopedia (239 words)
Generally, a null result is a result which is null (nothing): that is, the absence of an observable result.
In physics, the results of the Michelson-Morley experiment, which did not detect the aether, was of this type.
It is one of the possibilities in a three-valued logic (true, false, or null result).
Null - Wikipedia, the free encyclopedia (660 words)
In computer programming, null is a special value for a pointer (or other kind of reference) used to signify that the pointer intentionally does not have a target.
For example, in a vector space the null vector, is the zero vector, in set theory, the null set, is the set with zero elements, and in measure theory, a null set, is a set with zero measure.
Null fill in the vertical plane is used to prevent this.
  More results at FactBites »

 
 

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