ratio

Home > ... > Science and Technology > Mathematics > Mathematics > ...

Essential
reading

Compare
side-by-side

A Dictionary of Earth Sciences

The Columbia Encyclopedia, Sixth Edition

ratio

ratio The ratio of two quantities expressed in terms of the same unit is the fraction that has the first quantity as numerator and the second as denominator. For example, if in a group of 100 people 5 die, the ratio of deaths to the total number in the group is 5/100=1/20=.05. Ratios are indicated also by writing the two values with a colon between them, e.g., the ratio of 4 to 8 can be expressed by 4:8 as well as by 4/8.

Create a link to this page

Copy and paste this link tag into your Web page or blog:

<a href="http://www.encyclopedia.com/topic/.aspx#1E1-ratio" title="Facts and informations about ratio">ratio</a>

Give this article a thumbs-up on StumbleUpon

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"ratio." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 9 Jul. 2009 <http://www.encyclopedia.com>.

"ratio." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. (July 9, 2009). http://www.encyclopedia.com/doc/1E1-ratio.html

"ratio." The Columbia Encyclopedia, Sixth Edition. 2008. Retrieved July 09, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-ratio.html

Learn more about citation styles

ratio

A Dictionary of Earth Sciences | 1999 | | Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

ratio In remote sensing, the digital number value of one band of a multispectral image divided by the digital number value of another band. The ratio allows analysis of relative differences between channels.

Create a link to this page

Copy and paste this link tag into your Web page or blog:

<a href="http://www.encyclopedia.com/topic/.aspx#1O13-ratio" title="Facts and informations about ratio">ratio</a>

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

AILSA ALLABY and MICHAEL ALLABY. "ratio." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 9 Jul. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "ratio." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (July 9, 2009). http://www.encyclopedia.com/doc/1O13-ratio.html

AILSA ALLABY and MICHAEL ALLABY. "ratio." A Dictionary of Earth Sciences. 1999. Retrieved July 09, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-ratio.html

Learn more about citation styles

Related entries from encyclopedias, dictionaries and thesauruses

Rate these entries|See all related entries

Free newspaper and magazine articles

	What is your company's "bid-hit" ratio? (lookout). Magazine article from: Masonry Construction; 9/1/2002
	The spurious correlation of ratios that have common variables: a Monte Carlo examination of Pearson's formula. Magazine article from: The Journal of General Psychology; 4/1/1997
	Declines in sex ratio at birth and fetal deaths in Japan, and in U.S. whites but not African Americans.(Children's Health) Magazine article from: Environmental Health Perspectives; 6/1/2007

Facts and information from other sites

Related articles from newspapers, magazines, and more

	What is your company's "bid-hit" ratio? (lookout). Magazine article from: Masonry Construction; 9/1/2002; ; 640 words ; Bid-Hit ratio is the figure that the company successfully...on projects. For example, a 5:1 Bid-Hit-ratio means that for every five jobs bid or proposed...Do you know what your company's Bid-Hit ratio is? Do you keep track of it? How do you... Read more
	The spurious correlation of ratios that have common variables: a Monte Carlo examination of Pearson's formula. Magazine article from: The Journal of General Psychology; 4/1/1997; ; 700+ words ; Ratio variables (sometimes called index variables) are formed by...fictitious example of the problems that can occur when correlating ratio variables, by presenting a table of counts of births, storks...ago, Pearson (1897) showed that the correlation between two ratio variables that have the same ... Read more
	Declines in sex ratio at birth and fetal deaths in Japan, and in U.S. whites but not African Americans.(Children's Health) Magazine article from: Environmental Health Perspectives; 6/1/2007; ; 700+ words ; BACKGROUND: The expected ratio of male to female births is generally...OBJECTIVES: We describe trends in sex ratio at birth and in fetal deaths in the United...assembled to create information on sex ratio at birth and in fetal deaths in the United... Read more
	The interaction of salinity and Na/K ratio in seawater on growth, nutrient retention and food conversion of juvenile Litopenaeus Vannamei. Magazine article from: Journal of Shellfish Research; 4/1/2006; ; 700+ words ; ABSTRACT The effects of salinity, Na/K ratio and their interaction on growth, molting...salinity nor interaction effects, but Na/K ratio had an effect (P < 0.05). And there...that MF rose with the increment of Na/K ratio at both salinities. Final body weight... Read more
	Employment in public schools and the student-to-employee ratio. Magazine article from: Monthly Labor Review; 7/1/1994; ; 700+ words ; ...1964. As a result, the student-to-employee ratio fell from 13.3 in 1964 to 6.4 in 1990...recessionary periods, when the student-to-employee ratio continued to drop or at least held steady...recession, however, the student-to-employee ratio rose for the first time in the history... Read more
	The gender wage ratio: women's and men's earnings.(Table)(Report) Magazine article from: Fact Sheet Series; 4/1/2007; 554 words ; The ratio of the annual averages of women's and men's median...for full-time workers in 2006, about the same as the ratio's high of 81.0, reached in 2005. The median weekly earnings ratio has hovered around 80.0 since 2003. (The weekly earnings... Read more
	Ratio tables to promote proportional reasoning in the primary classroom: Shelley Dole describes ratio tables and demonstrates how they can be used to support the development of proportional reasoning.(Report) Magazine article from: Australian Primary Mathematics Classroom; 6/22/2008; ; 700+ words ; ...students that introduce and immerse them in ratio investigations. Some enjoyable tasks include finding the ratio of tongue rollers to non-tongue rollers...multiplicative relationship between quantities in a ratio is often difficult as this requires proportional... Read more
	J.B. on the rocks? (J.B. Hunt Transport Services Inc.'s rising operating costs' ratio) Magazine article from: Arkansas Business; 5/20/1991; ; 700+ words ; J.B. On The Rocks? Operating Ratio Continues Eight-Year Negative Trend...attention: J.B. Hunt's operating costs' ratio has risen steadily since the company...1983. The result? An ever-diminishing ratio of net profits to gross revenues as the... Read more
	Shift in sex ratio: male numbers sink in Great Lakes community.(Environews/ Science Selections) Magazine article from: Environmental Health Perspectives; 10/1/2005; ; 526 words ; Sex ratio--the proportion of male to female live births...constant. For example, the worldwide human sex ratio ranges from 102 to 108 male births for every...documented a significant skewing of the human sex ratio in a population located in a heavily polluted... Read more
	Plating high aspect ratio PCBs: achieving proper copper deposition in holes on thicker boards is no easy task, even with reverse pulse plating. Understanding the ins and outs of electrolyte agitation is critical.(Copper Plating) Magazine article from: Printed Circuit Design & Manufacture; 1/1/2005; ; 700+ words ; ...metallization during the production of high aspect ratio PCBs, such as back panels, isn't easy...trend is for thicker panels with aspect ratio up to 15:1. One of the limiting factors...mass transport of ions into high aspect ratio holes. Achieving the required copper thickness... Read more