World Library  
Flag as Inappropriate
Email this Article

Null result

Article Id: WHEBN0030875775
Reproduction Date:

Title: Null result  
Author: World Heritage Encyclopedia
Language: English
Subject: Argument from ignorance, Meta-analysis, Design of experiments, Evidence of absence, Nothing
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Null result

In science, a null result is a result without the expected content: that is, the proposed result is absent.[1] 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, meaning "no consequence".

In statistical hypothesis testing, a null result occurs when an experimental result is not significantly different from what is to be expected under the null hypothesis. While some effect may in fact be observed, its probability (under the null hypothesis) does not exceed the significance level, i.e., the threshold set prior to testing for rejection of the null hypothesis. The significance level varies, but is often set at 0.05 (5%).

As an example in physics, the results of the Michelson–Morley experiment 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 experiment 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.[2]

Scientific journals for null results

There are now several scientific journals dedicated to the publication of negative or null results, including the following:

See also

External links

  • All Results Journals
  • European Journal of Negative Results in Biomedicine
  • Journal of Articles in Support of the Null Hypothesis
  • Journal of Negative Results
  • Journal of Negative Results in Biomedicine
  • Journal of Pharmaceutical Negative Results

References

  1. ^ Giunti, C.; et al. (1999). "New ordering principle for the classical statistical analysis of Poisson processes with background".  
  2. ^ Role of the Michelson-Morley experiments in making determinations about competing theories
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.