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Poisson's ratio print that page

other two directions perpendicular to the direction of compression. This phenomenon is called the Poisson effect . Poisson 's ratio ν ( nu ) is a measure of the Poisson effect. The Poisson ratio is the ratio of the fraction (or percent) of expansion divided by the fraction (or percent

wikipedia.org | 2011/9/28 1:12:34

Relative risk print that page

is the risk of an event (or of developing a disease) relative to exposure. Relative risk is a ratio of the probability of the event occurring in the exposed group versus a non-exposed group. [ 1 ] Consider an example where the probability of developing lung cancer among smokers was

wikipedia.org | 2011/5/19 13:50:06

Poisson number print that page

Poisson number From Wikipedia, the free encyclopedia Jump to: navigation , search Poisson number can refer to: In mechanics, the reciprocal of Poisson 's ratio . 1 / v. In statistics, a number drawn from a Poisson distribution This disambiguation page lists articles

wikipedia.org | 2010/9/25 2:49:34

Noncentral hypergeometric distributions print that page

In statistics , the hypergeometric distribution is the discrete probability distribution generated by picking colored balls at random from an urn without replacement. Various generalizations to this distribution exist for cases where the picking of colored balls is biased so that balls

wikipedia.org | 2010/9/25 4:42:30

Pentagram map print that page

Exponential shrinking 3 Motivating discussion 4 Coordinates for the moduli space 4.1 Cross ratio 4.2 The corner coordinates 4.3 (ab) coordinates 5 Formula for the pentagram map 5.1 As a birational mapping 5.2 As grid compatibility relations 6 Invariant structures

wikipedia.org | 2011/7/9 9:39:58

Index of dispersion print that page

In probability theory and statistics , the index of dispersion , [ 1 ] dispersion index, coefficient of dispersion, or variance-to-mean ratio (VMR) , like the coefficient of variation , is a normalized measure of the dispersion of a probability distribution : it is a measure used to

wikipedia.org | 2011/4/25 19:45:05

Data transformation (statistics) print that page

In statistics , data transformation refers to the application of a deterministic mathematical function to each point in a data set — that is, each data point z i is replaced with the transformed value y i = f ( z i ), where f is a function. Transforms are usually applied so that the

wikipedia.org | 2011/9/13 14:00:37

Rasch model print that page

Rasch models are particularly used in psychometrics , the field concerned with the theory and technique of psychological and educational measurement. In addition, they are increasingly being used in other areas, including the health profession and market research because of their general applicability

wikipedia.org | 2011/9/14 4:15:19

Martingale (probability theory) print that page

In probability theory , a martingale is a model of a fair game where no knowledge of past events can help to predict future winnings. In particular, a martingale is a sequence of random variables (i.e., a stochastic process ) for which, at a particular time in the realized sequence, the

wikipedia.org | 2011/9/2 16:28:28

White noise print that page


with linear frequency axis (vertical). We can therefore find Gaussian white noise, but also Poisson , Cauchy , etc. white noises. Thus, the two words "Gaussian" and "white" are often both specified in mathematical models of systems. Gaussian white noise is a good approximation of many real