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1 - nptel
1 - nptel

Methods for sparse analysis of high
Methods for sparse analysis of high

Date____________ Student`s
Date____________ Student`s

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Introduction to Probability Theory

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Ch_ 6 Student Notes

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Reference - Department of Statistics, Yale

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Chapter 3 - Random Variables

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Lecture 4 - Random walk, ruin problems and random

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A Survey of Probability Concepts

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Empirical cdf, quantiles, random variable generation, probability

... To generate N random variables from a (non-standard) cdf F(x) 1. Generate N random variables Ui from the uniform distribution on [0,1] 2. Find the inverse cdf (quantile function) F-1(p) = Q(p) 3. Compute Q(Ui) using the menu Calc/Calculator Example: Generate 50 rvs Xi with cdf F(x) = (1-x)3 1. Go to ...
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book here

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Class Slides - 4.1 - 4.4 - Statistics for Decision Making

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Solutions

Conditional Expectation and Martingales
Conditional Expectation and Martingales

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General theory of stochastic processes

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Random Field Theory - Wellcome Trust Centre for Neuroimaging

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Probability Trees

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1 Discrete-time Markov chains

... process is called the simple symmetric random walk. Since the chain can only go up or down by 1 at each step, we see that Pi,i+1 = p, Pi,iāˆ’1 = 1 āˆ’ p and all other transition probabilities are zero. Requiring that X0 = 0 is not necessary, we can start with any deterministic state X0 = i in which case ...
Feb 23 (Lecture 3)
Feb 23 (Lecture 3)

< 1 ... 70 71 72 73 74 75 76 77 78 ... 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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