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  Normal distribution - Wikipedia, the free encyclopedia
The normal distribution also arises in many areas of statistics: for example, the sampling distribution of the mean is approximately normal, even if the distribution of the population the sample is taken from is not normal.
The normal distribution was first introduced by de Moivre in an article in 1733 (reprinted in the second edition of his The Doctrine of Chances, 1738) in the context of approximating certain binomial distributions for large n.
The derivation of the maximum-likelihood estimator of the covariance matrix of a multivariate normal distribution is perhaps surprisingly subtle and elegant.
en.wikipedia.org /wiki/Normal_distribution   (4114 words)

  
 F distribution (1 of 3)   (Site not responding. Last check: 2007-11-05)
The F distribution is the distribution of the ratio of two estimates of variance.
The F distribution has two parameters: degrees of freedom numerator (dfn) and degrees of freedom denominator (dfd).
The shape of the F distribution depends on dfn and dfd.
www.ruf.rice.edu /~lane/hyperstat/A107688.html   (188 words)

  
 Cumulative distribution function - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-05)
It is conventional to use a capital F for a cumulative distribution function, in contrast to the lower-case f used for probability density functions and probability mass functions.
Continuity of the distribution implies that P(X = a) = P(X = b) = 0, so the difference between "<" and "≤" ceases to be important in this context.) The function f is equal to the derivative of F almost everywhere, and it is called the probability density function of the distribution of X.
The Kolmogorov-Smirnov test is based on cumulative distribution functions and can be used to test to see whether two empirical distributions are different or whether an empirical distribution is different from an ideal distribution.
en.wikipedia.org /wiki/Cumulative_distribution_function   (556 words)

  
 1.3.6.6.5. F Distribution
Since the F distribution is typically used to develop hypothesis tests and confidence intervals and rarely for modeling applications, we omit the formulas and plots for the hazard, cumulative hazard, survival, and inverse survival probability functions.
Since the F distribution is typically used to develop hypothesis tests and confidence intervals and rarely for modeling applications, we omit any discussion of parameter estimation.
The F distribution is used in many cases for the critical regions for hypothesis tests and in determining confidence intervals.
www.itl.nist.gov /div898/handbook/eda/section3/eda3665.htm   (314 words)

  
 PlanetMath: f distribution
the ``F'' in the F distribution is given in honor of Statistician R. Fisher.
Cross-references: f test, sample variances, statistic, variance, mean, normal distribution, t distribution, non-centrality parameter, density functions, graphs, fixed, beta function, probability density function, transformation, distribution, degrees, independent, random variables
This is version 8 of f distribution, born on 2004-06-25, modified 2005-02-23.
planetmath.org /encyclopedia/FDistribution.html   (222 words)

  
 The Fisher F Distribution
The distribution defined by the density function in Exercise 1 is known as the F distribution with m degrees of freedom in the numerator and n degrees of freedom in the denominator.
Suppose that X has the F distribution with m degrees of freedom in the numerator and m degrees of freedom in the denominator.
Show that 1/X has the F distribution with n degrees of freedom in the numerator and m degrees of freedom in the denominator.
www.fmi.uni-sofia.bg /vesta/Virtual_Labs/special/special5.html   (436 words)

  
 Distribution Tables
The F distribution is a right-skewed distribution used most commonly in Analysis of Variance (see ANOVA/MANOVA).
The F distribution is a ratio of two Chi-square distributions, and a specific F distribution is denoted by the degrees of freedom for the numerator Chi-square and the degrees of freedom for the denominator Chi-square.
For example, to determine the.05 critical value for an F distribution with 10 and 12 degrees of freedom, look in the 10 column (numerator) and 12 row (denominator) of the F Table for alpha=.05.
www.statsoft.com /textbook/sttable.html   (676 words)

  
 Chapter 11
The new distribution for this chapter is the F distribution.
The F distribution is a positively skewed distribution that ranges from 0 to infinity.
The first use of the F distribution is when you are comparing two population variances.
oak.cats.ohiou.edu /~db384988/notes11.htm   (853 words)

  
 Using the Statistics Toolbox (Statistics Toolbox)   (Site not responding. Last check: 2007-11-05)
distribution, the F distribution is a special case of the noncentral F distribution.
If the numerator of the ratio is a noncentral chi-square random variable divided by its degrees of freedom, the resulting distribution is the noncentral F distribution.
The main application of the noncentral F distribution is to calculate the power of a hypothesis test relative to a particular alternative.
www.crml.uab.edu /matlab/toolbox/stats/tutori19.html   (156 words)

  
 F_PDF   (Site not responding. Last check: 2007-11-05)
A positive integer, single- or double-precision floating-point scalar that specifies the number of degrees of freedom of the F distribution numerator.
A positive integer, single- or double-precision floating-point scalar that specifies the number of degrees of freedom of the F distribution denominator.
Use the following command to compute the probability that a random variable X, from the F distribution with five degrees of freedom in the numerator and 24 degrees of freedom in the denominator, is less than or equal to 3.90.
www.astro.virginia.edu /class/oconnell/astr511/idl_5.1_html/idl9b.htm   (122 words)

  
 Statistical Inference
For example, N(mu,sigma^2) represents the family of normal distributions where mu corresponds to the mean of a normal distribution and ranges over the real numbers (R) and sigma^2 corresponds to the variance of a normal distribution and ranges over the positive real numbers (R^+).
In many practical cases, we are forced to choose a family of distributions not knowing whether or not the distribution generating the observed samples is in this particular family.
For example, if the generating distribution is a zero-mean normal distribution, then the sample variance is a sufficient statistic for estimating sigma^2.
www.cs.brown.edu /research/ai/dynamics/tutorial/Documents/StatisticalInference.html   (792 words)

  
 1.3.6.7.3. Upper Critical Values of the F Distribution
This table contains the upper critical values of the F distribution.
This is demonstrated with the graph of an F distribution with
Because the F distribution is asymmetric, a two-sided test requires a set of of tables (not included here) that contain the rejection regions for both the lower and upper tails.
www.itl.nist.gov /div898/handbook/eda/section3/eda3673.htm   (1295 words)

  
 Inverse F Distribution
Beware that some of the F distribution approximations in the Handbook of Mathematical Functions aren't very accurate.
For generating random numbers with an F distribution, this approximation alone may be adequate.
-INTFD - Integral of F distribution from 0 to {omega}, with
www.chilton.com /~jimw/fdist.html   (440 words)

  
 F - Hutchinson encyclopedia article about F
The digamma came to represent the sound /f/ in Latin.
The Latin f was then adopted by all alphabets descended from the Roman.
In Welsh f is pronounced /v/; this was also the case in some Old English environments, as is still seen, for example, in the pronunciation of the word ‘of’.
encyclopedia.farlex.com /F   (216 words)

  
 Probability Distributions   (Site not responding. Last check: 2007-11-05)
The Gamma Distribution is a general distribution covering many special cases, including the Chi-squared distribution and Exponential distribution.
The Log-Normal Distribution is useful when the raw data are highly skewed whereas the natural log of the data are normally distributed.
The Beta Distribution is a continuous distribution bounded between 0 and 1.
www.stat.vt.edu /~sundar/java/applets/Distributions.html   (494 words)

  
 ED230B/C
The F distributions are a family of distributions with two paramenters, the degrees of freedom of the sample variances in the numerator and denominator of the F statistic.
The F distributions are not symmetric but are right skewed.
The peak of the F density curve is near one; values far from one in either direction provide evidence against the hypothesis of equal standard deviations.
www.gseis.ucla.edu /courses/help/dist3.html   (113 words)

  
 [No title]
It's another distribution: If f is a distribution and g is a function then the distribution gf is defined by [gf, phi] = [f, g*phi] (* is multiplication).
It's another >> distribution: If f is a distribution and g is a function then >> the distribution gf is defined by >> >> [gf, phi] = [f, g*phi] (* is multiplication).
Y consists of distributions f whose Fourier transforms f^hat lie in the subspace L^2 of the space of distributions.
www.math.niu.edu /~rusin/known-math/00_incoming/distributions2   (1322 words)

  
 Fast Facts About the TPW Article Submission Program
The cost of creating and distributing the article will always be less than $500 and will generate results for years to come.
Distributing one or two articles may not deliver the kind of results you are expecting, because publishers may not be paying close enough attention to what you are sending to them.
TPW is the one location where you can send your article for distribution to more than 17,000 publishers and webmasters looking for free reprint content.
www.thephantomwriters.com /distribution   (3371 words)

  
 resume distribution resume blasting
All of the comments below are based on 6 years experience as a recruiter and a year long test where we signed up for and recieved "all resumes", all categories, no restrictions, from every resume distribution service we could find (over a dozen).
Based on this, using a resume distribution or "resume blasting" service has advantages and disadvantages.
In a study we did last year, they distributed over 3 times as many resumes as the next most popular company.
www.resumeannounce.com /resume-distribution.html   (2017 words)

  
 The F Distribution   (Site not responding. Last check: 2007-11-05)
The distribution defined by the density function in Exercise 1 is known as the
The distribution function and the quantile function do not have simple, closed-form representations.
Vary the parameters and note the shape of the density function and the distribution function.
www.ds.unifi.it /VL/VL_EN/special/special6.html   (301 words)

  
 M241 Probability Discussion Notes Chapter 4
Discrete Distributions: Distributions of random variables whose range is either a finite number of values or a countably infinite number of values.
This is the Binomial(100,.3829) distribution, which can be approximated by the normal distribution with mean np and variance npq.
By the Fundamental Theorem of calculus, for a continuous distribution, f(x) is the derivative of F(x) and F(x) an antiderivative (indefinite integral) of f(x) (The one satisfying F(-inf) = 0 and F(+inf) = 1.
www.saintjoe.edu /~karend/m241/m241-4.html   (1363 words)

  
 Maxwell-Boltzmann Distribution Function
TRAPZ (f, xlo, xhi, nstep) where TRAPZ returns the integral of f f = the function to be integrated (input).
f is a function of one variable (i.e., f(x)).
f should be declared as an external function in the calling program.
www.ee.umd.edu /~nsw/ench250/boltzman.htm   (781 words)

  
 2.2 Exponential, Hyper-exponential and Hypo-exponential Distributions   (Site not responding. Last check: 2007-11-05)
One of the most studied continuous distributions is the exponential distribution, which is widely used to describe many stochastic processes.
is the parameter that characterizes the distribution, and
The number of parameters of a phase-type distribution depends on the number of parameters of its components.
www.cs.wm.edu /~riska/main/node10.html   (476 words)

  
 Benchmarking - Distribution & Logistics Management Benchmarking Consortium
is currently a free association of distribution and logistics organizations within major corporations.
To create a cooperative environment where full understanding of the performance and enablers of "best in class" internet service provision processes can be obtained and shared at reasonable cost.
To support the use of benchmarking to facilitate distribution and logistics process improvement and the achievement of accuracy, timeliness and efficiency.
www.dlmbc.com   (601 words)

  
 [No title]
An example of a generalized linear model is the Logit Regression model, where the dependent variable is assumed to be binomial, and the link function is the logit transformation.
For example, the values from the joint distribution of two random variables, X and Y, can be easily simulated by the Gibbs sampler that uses their conditional distributions rather than their joint distribution.
The Gompertz distribution is a theoretical distribution of survival times.
www.statsoft.com /textbook/glosf.html   (3048 words)

  
 Rev Significance Testing online. For z-score, t-test, f-test, correlation and chi-square distribution   (Site not responding. Last check: 2007-11-05)
For z-score, t-test, f-test, correlation and chi-square distribution
The procedures here are only relevant for continuous distribution, for discrete distributions use the relevant discrete SISA procedure.
The Chi-square distribution is at the basis of calculating the significance of the Correlation co-efficient also.
home.clara.net /sisa/revsghlp.htm   (456 words)

  
 Velocity Probability Distribution Functions in Three Dimensions, Etc.
We know that the gas is isotropic (all directions are equivalent) so that the velocity probability distribution function must be the same in all directions.
The function F can be regarded either as a function of the three Cartesian velocity coordinates or of the speed, v, and the two angles which determine its direction.
This implies that F must be a function of v alone and not of the angles which determine the direction of the velocity vector.)
www.chem.arizona.edu /~salzmanr/kmt3dpdf/kmt3dpdf.html   (1378 words)

  
 Distribution Group: Resources for improved warehouse and distribution center management
For more than 20 years, Distribution Group publications have helped distribution center and warehouse managers increase productivity, cut costs and meet increasing customer demands in the warehouse.
Distribution Center Management brings you proven strategies for managing people, materials and costs in the warehouse and distribution center.
Distribution Digest an all new free e-newsletter which brings you the same high quality management information available in the Distribution Group’s print publications.
www.distributiongroup.com   (386 words)

  
 F-distribution -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-11-05)
It is also known as Snedecor's F distribution or the Fisher-Snedecor distribution (after (Click link for more info and facts about Ronald Fisher) Ronald Fisher and (Click link for more info and facts about George W. Snedecor) George W. Snedecor).
A generalization of the (central) F-distribution is the (Click link for more info and facts about noncentral F-distribution) noncentral F-distribution.
is a (Click link for more info and facts about chi-square distribution) chi-square distribution as for.
www.absoluteastronomy.com /encyclopedia/f/f/f-distribution.htm   (260 words)

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