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Linear inverse problems on Erd˝os
Linear inverse problems on Erd˝os

... refinements that can be considered for the recovery. This paper focuses on exact recovery, which requires that all vertexvariables be recovered simultaneously with high probability as the number of vertices diverges. The probability measure may depend on the graph ensemble or simply on the kernel Q ...
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An introduction to probability theory

MARKOV CHAINS
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... never hits down the line two consecutive times, but if he hits cross-court on one shot, on the next shot he can hit cross-court with .75 probability and down the line with .25 probability. a) ...
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Combinatorial Description and Free Convolution

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... Definition 2.1. A n-dimensional random vector is a measurable map X : Ω → Rn . (As usual Rn is equipped with its Borel σ-field.) Fact: If X has components X = (X1 , . . . , Xn ) then X is a random vector iff the Xi are random variables. More generally we can consider measurable functions X from Ω to ...
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Cuckoo Hashing for Undergraduates

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Module 5 - University of Pittsburgh

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probability literacy, statistical literacy, adult numeracy, quantitative

... a formal mathematical notation or informal means, of the chance or likelihood of occurrence of events. Such perceptions depend on the interaction between factors operating in external situations and within persons who face these situations. Consider the Insurance example: "Insurance". You and your s ...
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1. Statistics, Primary and Secondary data, Classification and

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Solutions - U.I.U.C. Math

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A Short Introduction to Probability

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Review for Annals of Probability

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Bayes law. Sensitivity, specificity.

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Weak Convergence

< 1 ... 27 28 29 30 31 32 33 34 35 ... 157 >

Randomness



Randomness is the lack of pattern or predictability in events. A random sequence of events, symbols or steps has no order and does not follow an intelligible pattern or combination. Individual random events are by definition unpredictable, but in many cases the frequency of different outcomes over a large number of events (or ""trials"") is predictable. For example, when throwing two dice, the outcome of any particular roll is unpredictable, but a sum of 7 will occur twice as often as 4. In this view, randomness is a measure of uncertainty of an outcome, rather than haphazardness, and applies to concepts of chance, probability, and information entropy.The fields of mathematics, probability, and statistics use formal definitions of randomness. In statistics, a random variable is an assignment of a numerical value to each possible outcome of an event space. This association facilitates the identification and the calculation of probabilities of the events. Random variables can appear in random sequences. A random process is a sequence of random variables whose outcomes do not follow a deterministic pattern, but follow an evolution described by probability distributions. These and other constructs are extremely useful in probability theory and the various applications of randomness.Randomness is most often used in statistics to signify well-defined statistical properties. Monte Carlo methods, which rely on random input (such as from random number generators or pseudorandom number generators), are important techniques in science, as, for instance, in computational science. By analogy, quasi-Monte Carlo methods use quasirandom number generators.Random selection is a method of selecting items (often called units) from a population where the probability of choosing a specific item is the proportion of those items in the population. For example, with a bowl containing just 10 red marbles and 90 blue marbles, a random selection mechanism would choose a red marble with probability 1/10. Note that a random selection mechanism that selected 10 marbles from this bowl would not necessarily result in 1 red and 9 blue. In situations where a population consists of items that are distinguishable, a random selection mechanism requires equal probabilities for any item to be chosen. That is, if the selection process is such that each member of a population, of say research subjects, has the same probability of being chosen then we can say the selection process is random.
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