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Greenwood Statistic
The Greenwood statistic is a spacing statistic and can be used to evaluate clustering of events in time or locations in space. Greenwood, Major (1946) The Statistical Study of Infectious Diseases. '' Journal of the Royal Statistical Society'', 109(2): 85–110. Definition In general, for a given sequence of events in time or space the statistic is given by:. :G(n)=\sum^_D^2_i , where D_i represents the interval between events or points in space and is a number between 0 and 1 such that the sum of all D_i = 1. Where intervals are given by numbers that do not represent a fraction of the time period or distance, the Greenwood statistic is modified and is given by: :G(n)=\frac , where: :T_n=\sum^_X_i, and X_i represents the length of the i''th interval, which is either the time between events or the distances between points in space. A reformulation of the statistic yields :G(n)=\tfrac (\tfracC_v^2+1) , where C_v is the sample coefficient of variation In probability ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Major Greenwood
Major Greenwood FRS (9 August 1880 – 5 October 1949) was an English epidemiologist and statistician. Biography Major Greenwood junior was born in Shoreditch in London's East End, the only child of Major Greenwood, a physician in general practice there ("Major" was his forename, not a military rank.) and his wife Annie, daughter of Peter Lodwick Burchell, F.R.C.S., M.B., L.S.A.Burke's Landed Gentry, 18th ed., vol. I, 1965, pg 338-343, 'Greenwood formerly of Haddenham' pedigree The Greenwood family is recorded back to the twelfth century in the person of Wyomarus Greenwode, of Greenwode Leghe, near Heptonstall, Yorkshire, caterer to the Empress Maude in 1154. Greenwood was educated on the classical side at Merchant Taylors' School and went on to study medicine at University College London and the London Hospital. On qualifying in 1904 he worked for a time as assistant to his father but after a few months he gave up clinical practice for good. He went to work as a demonstr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of The Royal Statistical Society
The ''Journal of the Royal Statistical Society'' is a peer-reviewed scientific journal of statistics. It comprises three series and is published by Wiley for the Royal Statistical Society. History The Statistical Society of London was founded in 1834, but would not begin producing a journal for four years. From 1834 to 1837, members of the society would read the results of their studies to the other members, and some details were recorded in the proceedings. The first study reported to the society in 1834 was a simple survey of the occupations of people in Manchester, England. Conducted by going door-to-door and inquiring, the study revealed that the most common profession was mill-hands, followed closely by weavers. When founded, the membership of the Statistical Society of London overlapped almost completely with the statistical section of the British Association for the Advancement of Science. In 1837 a volume of ''Transactions of the Statistical Society of London'' were wri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coefficient Of Variation
In probability theory and statistics, the coefficient of variation (CV), also known as relative standard deviation (RSD), is a standardized measure of dispersion of a probability distribution or frequency distribution. It is often expressed as a percentage, and is defined as the ratio of the standard deviation \sigma to the mean \mu (or its absolute value, The CV or RSD is widely used in analytical chemistry to express the precision and repeatability of an assay. It is also commonly used in fields such as engineering or physics when doing quality assurance studies and ANOVA gauge R&R, by economists and investors in economic models, and in neuroscience. Definition The coefficient of variation (CV) is defined as the ratio of the standard deviation \ \sigma to the mean \ \mu , c_ = \frac. It shows the extent of variability in relation to the mean of the population. The coefficient of variation should be computed only for data measured on scales that have a meaningful zer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spatial Analysis
Spatial analysis or spatial statistics includes any of the formal techniques which studies entities using their topological, geometric, or geographic properties. Spatial analysis includes a variety of techniques, many still in their early development, using different analytic approaches and applied in fields as diverse as astronomy, with its studies of the placement of galaxies in the cosmos, to chip fabrication engineering, with its use of "place and route" algorithms to build complex wiring structures. In a more restricted sense, spatial analysis is the technique applied to structures at the human scale, most notably in the analysis of geographic data or transcriptomics data. Complex issues arise in spatial analysis, many of which are neither clearly defined nor completely resolved, but form the basis for current research. The most fundamental of these is the problem of defining the spatial location of the entities being studied. Classification of the techniques of spatial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
