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# Topic: Logistic distribution

###### In the News (Thu 23 May 13)

 Logistic distribution - Wikipedia, the free encyclopedia The logistic distribution is closely related to the logistic function and the logistic equation which also follow from the work of Verhulst. Related to the logistic distribution is the half-logistic distribution. The inverse cumulative distribution function of the logistic distribution is F en.wikipedia.org /wiki/Logistic_distribution   (430 words)

 The Logistic Distribution The logistic distribution has been used for growth models, and is used in a certain type of regression known as the logistic regression. The shape of the logistic distribution is very similar to that of the normal distribution. The main difference between the normal distribution and logistic distribution lies in the tails and in the behavior of the failure rate function. www.weibull.com /LifeDataWeb/the_logistic_distribution.htm   (526 words)

 Distribution Fitting To determine this underlying distribution, it is common to fit the observed distribution to a theoretical distribution by comparing the frequencies observed in the data to the expected frequencies of the theoretical distribution (i.e., a Chi-square goodness of fit test). The major distributions that have been proposed for modeling survival or failure times are the exponential (and linear exponential) distribution, the Weibull distribution of extreme events, and the Gompertz distribution. The logistic distribution is used to model binary responses (e.g., Gender) and is commonly used in logistic regression. www.statsoft.com /textbook/stdisfit.html   (1769 words)

 Logistic Distribution The logistic distribution is a symmetrical bell shaped distribution. One of its applications is an alternative to the Normal distribution when a higher proportion of the of the population being modeled is distributed in the tails. The logistic distribution is sometimes defined in terms of a location parameter (the mean) and a scale factor or standard deviation. www.brighton-webs.co.uk /distributions/logistic.asp   (91 words)

 Functions and CALL Routines : CDF The CDF function for the beta distribution returns the probability that an observation from a beta distribution, with shape parameters a and b, is less than or equal to x. The CDF function for the chi-squared distribution returns the probability that an observation from a chi-squared distribution, with df degrees of freedom and noncentrality parameter nc, is less than or equal to x. The CDF function for the F distribution returns the probability that an observation from an F distribution, with ndf numerator degrees of freedom, ddf denominator degrees of freedom, and noncentrality parameter nc, is less than or equal to x. www.asu.edu /sas/sasdoc/sashtml/lgref/z0208980.htm   (1101 words)

 Abstracts of Papers by John Kolassa Calculations for the logistic distribution are presented to illustrate the case of a known but intractable cumulant generating function, and an example involving an overdispersed binomial model is presented to illustrate the case of an unavailable cumulant generating function. The equilibrium distribution of this chain approximates the joint distribution of the sufficient statistics associated with the parameters of interest conditional on the observed values of the sufficient statistics associated with the nuisance parameters. This approximation is then used iteratively in conjunction with MC methods to generate a sample from a distribution that approximates the joint distribution of the sufficient statistics associated with the parameters of interest conditional on the observed values of the sufficient statistics associated with the nuisance parameters. www.stat.rutgers.edu /~kolassa/abs.html   (2822 words)

 Logistic and Distribution Distribution is carried out by means of a fleet of adjusted trucks including the insurance of goods in transit. Comprehensive activity in the realm of shipment distribution enables the transportation of goods in a distribution method according to branches/stores countrywide and as onetime distribution, as well as building distribution lines for regular distribution ad the ability of integrating them in cargo transportation. Full transparency characterizes the logistic activities of processes and performance data assisted by the computerized system that supports the direct link to the customer interfaced with the customer's system or, alternately, by means of Back Office. www.ashdod-bonded.co.il /logistic-e.html   (237 words)

 Chapter 3 Logistic Regression Diagnostics When the assumptions of logistic regression analysis are not met, we may have problems, such as biased coefficient estimates or very large standard errors for the logistic regression coefficients, and these problems may lead to invalid statistical inferences. The pseudo R-square is not measured in terms of variance, since in logistic regression the variance is fixed as the variance of the standard logistic distribution. Since logistic regression uses the maximal likelihood principle, the goal in logistic regression is to minimize the sum of the deviance residuals. www.ats.ucla.edu /stat/stata/webbooks/logistic/chapter3/statalog3.htm   (7550 words)

 Handbook of the Logistic Distribution   (Site not responding. Last check: 2007-10-13) The handbook skims over the early history of the logistic distribution, which can be found in more detail in RMT 6:4 p. A population distributed according to this function would have mean 0, and standard deviation 1. The only indication of these is in the sentence: "The logistic function has also been used in studies of physiochemical phenomenon..., geological studies..., and psychological studies by Birnbaum and Dudman (1963), Lord (1965), Sanathanan (1974), and Formann (1982)" (p. www.rasch.org /rmt/rmt82n.htm   (415 words)

 Logistic Regression   (Site not responding. Last check: 2007-10-13) If we code like this, then the mean of the distribution is equal to the proportion of 1s in the distribution. For example if there are 100 people in the distribution and 30 of them are coded 1, then the mean of the distribution is.30, which is the proportion of 1s. The mean of the distribution is also the probability of drawing a person labeled as 1 at random from the distribution. luna.cas.usf.edu /~mbrannic/files/regression/Logistic.html   (2682 words)

 BIODIVERSITY RESEARCH In this test, the differences between the former and latter distributions were computed for each biosurvey, producing the same effect as controlling for all variables except the scores of the respective distributions on it. Since the logistic-J distribution scored lower (i.e., better) on the 125 biosurveys, we may assert that it is, with very high probability (0.975) the superior descriptor of community abundances in the most general sense. In short, it may be claimed that the special logistic-J distribution outperforms the log-series distribution by a statistically discernible margin over all possible field biosurveys (of the type with which we are familiar, at least) with a probability of 0.999. www.csd.uwo.ca /faculty/akd/environment   (3581 words)

 Confidence Bounds for the Logistic Distribution   (Site not responding. Last check: 2007-10-13) In this section, we present the methods used in the application to estimate the different types of confidence bounds for logistically distributed data. is the log-likelihood function of the normal distribution, described in the Statistical Background chapter and Appendix C. The lifetime of a mechanical valve is known to follow a logistic distribution. www.weibull.com /LifeDataWeb/confidence_bounds_for_the_logistic_distribution.htm   (248 words)

 Logistic Solutions Inc. is logistics provider that specializes in 3PL, harbor drayage, warehousing, interstate and LTL ... Logistic Solutions Inc. is logistics provider that specializes in 3PL, harbor drayage, warehousing, interstate and LTL trucking, air cargo shipment, railroad shipping, ocean freight, and import and export management. LSI is a cutting edge commercial logistics provider among interstate trucking companies, freight shippers and freight trucking companies and is located in Phoenix. Logistic Solutions is the premier warehousing logistics specialist in Arizona. www.logisticsolutionsinc.com   (184 words)

 A Variety of Distributions Students can compare the shapes of the various distributions and note the relationship between the descriptive statistics and the characteristics of the plots. Note in particular that even with large samples, several of these distributions look to the eye like the normal distribution, even though they are not normal. More advanced students might want to look up the logistic distribution in another source and see how it differs from the normal distribution. www.uvm.edu /~dhowell/StatPages/More_Stuff/Distributions.html   (484 words)

 Esa logistika - transport, storage, logistic, distribution, custom clearance Logistic chain as a tool for gaining a competitive advantage, hand in hand with our clients we optimize the processes Our mission is to offer our customers a competitive advantage by providing them with a reliable and flexible logistic solution, which optimises their costs. We want to become one of the best providers of complete solutions for logistics and distribution in the Czech Republic and Slovakia and achieve a sustainable growth on the European market. www.esa.cz /en/onas.htm   (336 words)

 Distribution and Logistics Companies Caltop Logistics - A non-profit shippers’ association for the distribution of small shipments within the Western Region at competitive rates. Logistics Solutions Europe - Formed to meet the ever increasing demands and requirements for companies wishing to re-engineer or health check their physical supply chain. Rapid Global Logistics - Logistics and distribution in CA area. www.1800miti.com /links/warehouse/logistics.html   (2259 words)

 Half-logistic distribution - Wikipedia, the free encyclopedia In probability theory and statistics, the half-logistic distribution is a continuous probability distribution—the distribution of the absolute value of a random variable following the logistic distribution. The cumulative distribution function (cdf) of the half-logistic distribution is intimately related to the cdf of the logistic distribution. Similarily, the probability density function (pdf) of the half-logistic distribution is en.wikipedia.org /wiki/Half-logistic_distribution   (245 words)

 Logistic Distribution - Definition, Graphs, Applications, Parameter Estimation StatAssist displays all types of graphs and properties of more than 40 distributions (including Logistic), presenting the results in an easy to read and understand manner. moments, quantiles, and tail probabilities depending on the distribution parameters you specify. It enables you to determine how well the distribution you selected fits to your sample data, based on the goodness of fit tests and high-quality graphs. www.mathwave.com /articles/logistic_distribution.html   (90 words)

 Amazon.com: Logistic Regression (2nd Edition): Books: David G. Kleinbaum,Mitchell Klein,E. Rihl Pryor   (Site not responding. Last check: 2007-10-13) This is the second edition of this text on logistic regression methods. Logistic Regression: A Primer (Quantitative Applications in the Social Sciences) by Fred C. Pampel It's aim is to give a basic competence in the use of logistic regression, related techniques, and the software that deal with them. www.amazon.com /Logistic-Regression-2nd-David-Kleinbaum/dp/0387953973   (1718 words)

 Supported Models   (Site not responding. Last check: 2007-10-13) to be a(n inverse) logistic transformation of a linear function of a set of explanatory variables. : The rare events logistic regression option (see Section 12.29) estimates the same model as the logit, but corrects for bias due to rare events (when one of the outcomes is much more prevalent than the other). : The ordinal logistic model (see Section 12.22) specifies the stochastic component of the unobserved variable to be a standard logistic distribution. gking.harvard.edu /zelig/docs/Supported_Models.html   (1008 words)

 [No title] Compared to the normal distribution (mean=0, variance=1):    The function of the form  EMBED Equation.3  (also written as  EMBED Equation.3 ) is known as the ‘logit’ or ‘sigmoid’ function. Logistic Classification The binary classification problem: Given the value of k continuous independent variables  EMBED Equation.3 , we would like to find the value of a binary classification variable y. Logistic Classification vs. Naïve Bayes: Form the Bayesian Networks point of view Logistic Regression is the mirror image of Naïve Bayes:      In the Naïve Bayes classifier we compute P(yX) by computing P(xy), using Bayes rule and the fact that all the variables are independent given the class variable. www.cs.huji.ac.il /~arielj/reading/logist.doc   (1669 words)

 Categorical Dependent Variable Models Using SAS, STATA, LIMDEP, and SPSS The standard logistic distribution looks as if someone has weighed down the peak of the standard normal distribution and strained its tails. As a result, the cumulative density function (CDF) of the standard normal distribution is steeper in the middle than the CDF of the standard logistic distribution and quickly approaches zero on the left and one on the right. The LOGISTIC and PROBIT procedures of SAS/STAT have been commonly used, but the QLIM and MDC procedures of SAS/ETS are noted for their advanced features. www.indiana.edu /~statmath/stat/all/cdvm/cdvm1.html   (838 words)

 Distribution and Logistics: e-logistic company - INFINITY INFORMATIONS Brokers Worldwide is a full service international mail distribution and letter shop company, specializing in the worldwide distribution of books, magazines, journals, catalogs, promotional mail, personalized correspondence, invoices, renewal invoices and parcels.......... We have implemented eEnabled solutions in all of the major processes of a distribution organization including sales and marketing automation, customer service, warehouse logistics, purchasing and inventory management, financial analysis and management. The primary business challenge which the logistics service providers face is the coordination and integration of the operational activities in order to meet commitments in delivery schedules. www.infinityinformations.net /distribution_and_logistic.html   (230 words)

 GL5PDF Although they do not give this version a specific name, Dataplot refers to it as either the generalized logistic type 5 or the Hosking generalized logistic distribution. The general form of the Hosking generalized logistic probability density function can be obtained by replacing x in the above formula with (x-loc)/scale. = 0 is equivalent to the logistic distribution. www.itl.nist.gov /div898/software/dataplot/refman2/auxillar/gl5pdf.htm   (581 words)

 VIP Transport Inc. - Plasma Television Sets Our Logistics Division offers premier transport and logistic services for high value products, both domestically and internationally. Not only will our dedicated logistics team provide you with the highest of quality service, but they will also control the costs for you and your company. Specializing in computer and medical equipment, VIP has provided distribution and logistic services for companies such as Toshiba America Medical, Beckman Coulter, Lucent Technologies, Ryder Logistics, and Nortel. www.vipmayflower.com /domestic/logistics.html   (200 words)

 Comparison of two fitting methods for the log-logistic distribution However, for estimating quantiles, GPWM provides better results only for very small sample sizes, especially when the distribution is quite asymmetrical. Although presently, LL is not one of the distributions frequently used in hydrology, we agree with some authors that it merits wider use in hydrological practice. For a clearer idea on the merits of LL, we compare it with three other distributions for fitting flood data from 114 hydrometric stations in Canada. www.agu.org /pubs/crossref/2003/2002WR001685.shtml   (258 words)

 Mentor logistic-logistic services-logistics consultancy-logistic consultant-distribution services   (Site not responding. Last check: 2007-10-13) At Mentor Logistics Services we are committed to working with our customers to add value to their business. As experienced Logistics professionals with knowledge of many operations & systems, we can undertake small one-off projects up to larger operational change. Provide a Warehousing & Distribution service to a variety of customers, including retailers and specialist logistics providers on a buy-in basis. www.mentorlogistics.co.uk   (382 words)

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