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Poisson's ratio is a measure of the deformation of a material in directions perpendicular to the loading direction. Learn about its origin, values, applications, and examples of materials with positive, negative, or auxetic Poisson's ratios.
The Poisson distribution is a discrete probability distribution that models the number of events occurring in a fixed interval of time or space with a constant mean rate. The formula for the probability mass function is given by e^−λλ^k/k!, where λ is the expected value and k is the number of events.
Poisson's equation is a partial differential equation that describes the potential field caused by a given charge or mass density distribution. It has applications in physics, such as electrostatics, Newtonian gravity, and surface reconstruction.
Learn how different probability distributions are related to each other through transformations, combinations, approximations, and other methods. See examples of special cases, convolutions, and duality among various distributions.
In probability theory and statistics, the Conway–Maxwell–Poisson (CMP or COM–Poisson) distribution is a discrete probability distribution named after Richard W. Conway, William L. Maxwell, and Siméon Denis Poisson that generalizes the Poisson distribution by adding a parameter to model overdispersion and underdispersion.
Poisson regression is a statistical model for count data and contingency tables, based on the Poisson distribution and the log-linear link function. Learn about its form, interpretation, estimation, applications, and extensions such as negative binomial regression.
Poisson's Ratio defines the ratio between the negative lateral strain and the longitudinal strain, so lateral strain can be calculated using: [1] ...
The use of the word auxetic to refer to this property probably began in 1991. [8] Recently, cells were shown to display a biological version of auxeticity under certain conditions. [9] Designs of composites with inverted hexagonal periodicity cell (auxetic hexagon), possessing negative Poisson ratios, were published in 1985. [10]