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Topic: Coefficient


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In the News (Tue 18 Jun 19)

  
 [No title]
One specific indicator is the Gini Coefficient, which, along with the Concentration Index, has been taken from the field of economics and applied to the study of health inequalities.
The first step for calculating the Gini coefficient using geopolitically aggregated data is to sort the geographic units by the health variable (e.g., infant mortality rate) from the worst to the best situation (highest to lowest rate).
Graph the curve using the X axis for the proportion of the cumulative population (live births) and the Y axis for the proportion of cumulative health variable observations (infant deaths).
www.paho.org /English/SHA/be_v22n1-Gini.htm   (985 words)

  
  Measuring inequality in household income: the Gini coefficient
In this case the curve comprises the horizontal axis and the right-hand vertical axis.
All the Gini coefficients shown in 'The effects of taxes and benefits on household income' article are based on distributions of equivalised household income.
The Gini coefficient is used to show the degree of income inequality between different groups of households in the population.
www.statistics.gov.uk /about/methodology_by_theme/gini/default.asp   (332 words)

  
  Measuring   (Site not responding. Last check: )
The quotient is the Gini coefficient, a measure of inequality.
In other words, the Gini coefficient is the area shaded in pink divided by the total of the areas shaded in pink and light blue-green.
The Gini coefficient for the United States in 1994 (according to the Census Bureau) was 0.456.
william-king.www.drexel.edu /top/prin/txt/factors/dist4.html   (206 words)

  
 Coefficient - coefficient
Coefficient is a scalable open source project based collaboration platform that can run in J2EE and web application containers.
Check out the javaword article on coefficient here.
Check out the demo of coefficient 0.9.5 here.
coefficient.sourceforge.net   (68 words)

  
 The Drag Coefficient
The drag coefficient is a number that engineers use to model all of the complex dependencies of shape and flow conditions on rocket drag.
This equation is simply a rearrangement of the drag equation where we solve for the drag coefficient in terms of the other variables.
The drag coefficient then expresses the ratio of the drag force to the force produced by the dynamic pressure times the area.
exploration.grc.nasa.gov /education/rocket/dragco.html   (505 words)

  
 The Drag Coefficient
The drag coefficient is a number that aerodynamicists use to model all of the complex dependencies of shape, inclination, and flow conditions on aircraft drag.
If we are considering an aircraft, we can think of the drag coefficient as being composed of two main components; a basic drag coefficient which includes the effects of skin friction and shape (form), and an additional drag coefficient related to the lift of the aircraft.
The induced drag coefficient Cdi is equal to the square of the lift coefficient Cl divided by the quantity: pi (3.14159) times the aspect ratio AR times an efficiency factor e.
www.grc.nasa.gov /WWW/K-12/airplane/dragco.html   (869 words)

  
 The Lift Coefficient
The lift coefficient is a number that aerodynamicists use to model all of the complex dependencies of shape, inclination, and some flow conditions on lift.
The lift coefficient Cl is equal to the lift L divided by the quantity: density r times half the velocity V squared times the wing area A.
The lift coefficient then expresses the ratio of the lift force to the force produced by the dynamic pressure times the area.
www.grc.nasa.gov /WWW/K-12/airplane/liftco.html   (440 words)

  
 Statistics Glossary - paired data, correlation & regression
A correlation coefficient is a number between -1 and 1 which measures the degree to which two variables are linearly related.
The Spearman rank correlation coefficient is one example of a correlation coefficient.
The multiple regression correlation coefficient, R², is a measure of the proportion of variability explained by, or due to the regression (linear relationship) in a sample of paired data.
www.stats.gla.ac.uk /steps/glossary/paired_data.html   (1076 words)

  
 Extinction coefficient   (Site not responding. Last check: )
Extinction Coefficient is the fraction of light lost to scattering and absorbtion per unit distance in a participating medium.
The optical properties of the solid are governed by the interaction between the solid and the electric field of the electromagnetic wave.
In electromagnetic terms extiction coefficient can be explained as the decay, or damping of the oscillation amplitude of the incident electric field
www.fisk.edu /~aburger/Published03_06/Introduction/Optical/Extinction_coefficient/extinction_coefficient.html   (103 words)

  
 Force
Therefore two coefficients of friction are sometimes quoted for a given pair of surfaces - a coefficient of static friction and a coefficent of kinetic friction.
In general, the coefficients of friction for static and kinetic friction are different.
Friction is typically characterized by a coefficient of friction which is the ratio of the frictional resistance force to the normal force which presses the surfaces together.
hyperphysics.phy-astr.gsu.edu /hbase/frict.html   (734 words)

  
 Energy dependence of linear attenuation coefficient
The larger the value of the attenuation coefficient, the more likely it is that photons of a given energy will interact in a given thickness of material.
While specific values of the attenuation coefficient will vary among materials for photons of a specified energy, the generalized shapes of plots (neglecting fine details) of attenuation coefficient versus photon energy are similar among different materials.
The reason for this overall shape is that the linear attenuation coefficient is made up of three major components, each of which depends on a different type of photon interaction.
www.hps.org /publicinformation/ate/q4080.html   (679 words)

  
 Individual Activity - Linear Correlation Coefficient
The linear correlation coefficient (r) is a number between -1 and 1 which measures how close to a straight line a set of points falls.
The closer to zero the correlation coefficient is, the less the points fall on a straight line (hence the term "linear" correlation coefficient).
The closer the correlation coefficient is to negative one, the more the points will fall along a line stretching from the upper left to the lower right.
lep694.gsfc.nasa.gov /lepedu/IA-CorrCoeff.html   (335 words)

  
 Mass attenuation coefficient
The mass attenuation coefficient is used to describe the total reduction of x and gamma radiation (photons) at a detector due to both energy absorption and scattering.
The mass attenuation coefficient tends to increase with increasing atomic number at the same photon energy, so materials with high atomic numbers (and, hence, high mass attenuation coefficients) are normally chosen to shield x and gamma radiation.
The molar extinction coefficient is analogous to the mass attenuation coefficient, but it is used to describe the absorption of light in a translucent medium.
www.hps.org /publicinformation/ate/q1632.html   (508 words)

  
 Diffusion-Limited Aggregation
Since the finite size of the particle and finite extent of the aggregate limits the lengths at which the power law applies, the first few points and the last few points on the graph should not be considered when fitting the curve with a straight line.
The fractal dimension of the aggregate with a sticking coefficient of 0.1 is 1.38, is 1.92 with a sticking coefficient of 0.01, and is 1.94 with a sticking coefficient of 0.01.
The fractal dimension of the aggregate with a sticking coefficient of 1.0 is 1.72, is 1.38 with a sticking coefficient of 0.5, is 1.78 with a sticking coefficient of 0.1, is 1.84 with a sticking coefficient of 0.01, and is 1.98 with a sticking coefficient of 0.001.
www.physics.uc.edu /~pinskia/dla/DLA.html   (1684 words)

  
 Kappa Coefficients: A Critical Appraisal
Kappa coefficients in epidemiology: an appraisal of a reappraisal.
Gross ST. The kappa coefficient of agreement for multiple observers when the number of subjects is small.
Maximum likelihood estimation of the kappa coefficient from bivariate logistic regression.
ourworld.compuserve.com /homepages/jsuebersax/kappa.htm   (1613 words)

  
 Friction Coefficient Tests of 416 Stainless Steel on Cartridge Brass   (Site not responding. Last check: )
The objective of this test series was to measure the Friction Coefficient or Coefficient of Friction between 416 Stainless Steel and Cartridge Brass for various surface finishes on the Stainless Steel.
The friction coefficient to be measured was that between the brass case head and the stainless steel.
The friction coefficient is the force it takes to make the brass slide (weight in the cup) divided by the normal force of the brass against the 416 Stainless steel.
www.varmintal.com /afric.htm   (2215 words)

  
 Precision Ballistic Coefficient Estimator
The method for determining the ballistic coefficient for cast bullets is essentially the same as for jacketed bullets with two exceptions.
The first is that cast bullets generally have a bore riding nose portion that is of a smaller diameter than the body of the main bullet and the second exception is that the overall length of the bullet is a factor in the calculations.
Estimation of the ballistic coefficient of cast bullets is nearly as accurate as with the jacketed bullets, and the calculations give reasonably good and comparative estimates of G1 ballistic coefficients.
www.uslink.net /~tom1/calcbc/calcbc.htm   (730 words)

  
 Coefficient Home Page
Coefficient, LLC is a provider of Information Technology Services, including wide area network access, project management, needs assessments, software development, network, Internet, and security solutions.
Coefficient is strictly vendor neutral; we are not a reseller of any particular hardware or software package.
Coefficient was founded by Paul Hirt and Jeroen Swanborn in the summer of 2001.
www.coefficient.net /index.htm   (153 words)

  
 Coefficient of Discharge
The coefficient of velocity is usually quite high, between 0.95 and 0.99.
The discharge coefficient could also be found by keeping the head constant and measuring the water discharged in a known time interval.
The ideal coefficient of contraction for a Borda's mouthpiece is 0.5.
www.du.edu /~jcalvert/tech/fluids/orifice.htm   (1026 words)

  
 Pearson's Correlation Coefficient   (Site not responding. Last check: )
Pearson's product-moment correlation coefficient, r, or simply the sample correlation coefficient, is a measure of extent to which two samples are linearly related.
Therefore, the Pearson's correlation coefficient can be described as the dot-product of two standard vectors divided by the rank of these vectors.
This correlation coefficient is regularly used and the user should be aware that a problem may exist in the results.
members.aol.com /btluke/pearson.html   (808 words)

  
 IFA Services: Statistics, Correlation coefficient
The square of the size of the correlation coefficient is the fraction of the variance of the one variable that can be explained from the variance of the other variable.
The correlation coefficient is calculated with the assumption that both variables are stochastic (i.e., bivariate Gaussian).
In regression analysis, the interpretation of the correlation coefficient is different from that of correlation analysis.
www.fon.hum.uva.nl /Service/Statistics/Correlation_coefficient.html   (573 words)

  
 THE CORRELATION COEFFICIENT
As with the correlation coefficient derived in Chapter 3, it would be desirable to have some measure which would range between something like 1.00 for perfect correlation, -1.00 for perfect negative correlation, and zero for no correlation.
Other alternative correlation coefficients are applicable to dichotomous data--observations in two variables that comprise only two magnitudes, as for stability and foreign conflict in Table 3.1 There are the phi, phi-ove-phi-max, and tetrachoric coefficients.
The correlation coefficient may thus "hang" on a few cases with unusually large or small magnitudes, and data transformation or alternative correlations might be used to avoid this problem.
www.hawaii.edu /powerkills/UC.HTM   (11715 words)

  
 FSpeed - Fast Calculation of Inbreeding Coefficient
I.e., in order for an individual to have a non-zero coefficient of inbreeding it is necessary for both father(sire) and mother(dam) to be descended from one or more common ancestors.
The degree of inbreeding is commonly expressed using a formula first derived by the famous American geneticist Sewall Wright early in the 20th century and for this reason it is often known as Wrights Coefficient of Inbreeding.
Traditionally the symbol F is used to signify the coefficient of inbreeding.
www.tenset.co.uk /fspeed   (430 words)

  
 SQL Server Database Performance Tuning And Other Articles
Coefficient has the ability to monitor the performance of a remote database server.
Coefficient 2.2.0 can be divided into main three categories with respect to its functionalities, which include Trace, Analysis, and Templates.
Coefficient can not only analyze traces that it collects directly, you also have the option of importing and exporting traces files in the CSV format.
www.sql-server-performance.com /da_coefficient_spotlight.asp   (1979 words)

  
 Coefficient Software Spotlight   (Site not responding. Last check: )
But Coefficient is a great tool to add to your SQL Server performance tuning toolbox, greatly boosting your ability to sneak a peek inside the workings of SQL Server, and best of all, presenting the data in a format that almost any DBA can understand.
Coefficient can be installed on your SQL Server if you wish (although this is not recommended for performance reasons), or it can be installed on most any desktop computer and communicate to your SQL Servers over your network (this option offers the best overall performance).
The first step to using Coefficient to analyze your SQL Server’s database performance is to add a SQL Server to the main screen, similar to how you register a SQL Server using Enterprise Manager.
www.sql-server-performance.com /coefficient_review.asp   (1970 words)

  
 Octanol-Water Partition Coefficient (Kow) Definition Page
The octanol-water partition coefficient is the ratio of the concentration of a chemical in octanol and in water at equilibrium and at a specified temperature.
An example would be using the coefficient to predict the extent a contaminant will bioaccumulate in fish.
The octanol-water partition coefficient has been correlated to water solubility; therefore, the water solubility of a substance can be used to estimate its octanol-water partition coefficient.
toxics.usgs.gov /definitions/kow.html   (324 words)

  
 coefficient - a definition from Whatis.com
1) In a mathematical equation, a coefficient is a constant by which a variable is multiplied.
It is customary to use lower-case, italic letters from the first half of the alphabet to represent constants whose values are not specified numerically.
Between temperatures of +20 °C and +70 °C, therefore, this component has a temperature coefficient of +0.02 ohm per degree Celsius, assuming the resistance-versus-temperature function is linear over that range of temperatures.
whatis.techtarget.com /definition/0,,sid9_gci777407,00.html   (286 words)

  
 Jaccard’s Coefficient
Jaccard's coefficient (measure similarity) and Jaccard's distance (measure dissimilarity) are measurement of asymmetric information on binary (and non-binary) variables.
Jaccard's coefficient between Apple and Banana is 1/4.
Jaccard's coefficient can be computed based on the number of elements in the intersection set divided by the number of elements in the union set
people.revoledu.com /kardi/tutorial/Similarity/Jaccard.html   (248 words)

  
 Become efficient with Coefficient - Java World
Coefficient uses the term projects, but in other contexts, projects are also called groups, workspaces, or share spaces.
Coefficient is open source (released under the Lesser General Public License, or LGPL).
Coefficient has been tested with JBoss and Tomcat, but it should be able to run in most EJB containers.
www.javaworld.com /javaworld/jw-09-2004/jw-0920-coefficient.html   (668 words)

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