For instance, if X is used to denote the outcome of a coin toss ("the experiment"), then the probability distribution of X would take the value 0.5 (1 in 2 or 1/2) for X = heads, and 0.5 for X = tails (assuming that the coin is fair). More commonly, probability distributions are used to compare the relative occurrence of many different random values.
Probability distributions can be defined in different ways and for discrete or for continuous variables. Distributions with special properties or for especially important applications are given specific names.
Introduction
A probability distribution is a mathematical description of the probabilities of events, subsets of the sample space. The sample space, often represented in notation by is the set of all possible outcomes of a random phenomenon being observed. The sample space may be any set: a set of real numbers, a set of descriptive labels, a set of vectors, a set of arbitrary non-numerical values, etc. For example, the sample space of a coin flip could be Ω = { "heads", "tails" }.
To define probability distributions for the specific case of random variables (so the sample space can be seen as a numeric set), it is common to distinguish between discrete and absolutely continuousrandom variables. In the discrete case, it is sufficient to specify a probability mass function assigning a probability to each possible outcome (e.g. when throwing a fair die, each of the six digits “1” to “6”, corresponding to the number of dots on the die, has the probability The probability of an event is then defined to be the sum of the probabilities of all outcomes that satisfy the event; for example, the probability of the event "the die rolls an even value" is
In contrast, when a random variable takes values from a continuum then by convention, any individual outcome is assigned probability zero. For such continuous random variables, only events that include infinitely many outcomes such as intervals have probability greater than 0.
For example, consider measuring the weight of a piece of ham in the supermarket, and assume the scale can provide arbitrarily many digits of precision. Then, the probability that it weighs exactly 500g must be zero because no matter how high the level of precision chosen, it cannot be assumed that there are no non-zero decimal digits in the remaining omitted digits ignored by the precision level.
However, for the same use case, it is possible to meet quality control requirements such as that a package of "500 g" of ham must weigh between 490 g and 510 g with at least 98% probability. This is possible because this measurement does not require as much precision from the underlying equipment.
Absolutely continuous probability distributions can be described in several ways. The probability density function describes the infinitesimal probability of any given value, and the probability that the outcome lies in a given interval can be computed by integrating the probability density function over that interval.[4] An alternative description of the distribution is by means of the cumulative distribution function, which describes the probability that the random variable is no larger than a given value (i.e., for some ). The cumulative distribution function is the area under the probability density function from to as shown in figure 1.[5]
General probability definition
A probability distribution can be described in various forms, such as by a probability mass function or a cumulative distribution function. One of the most general descriptions, which applies for absolutely continuous and discrete variables, is by means of a probability function whose input space is a σ-algebra, and gives a real numberprobability as its output, particularly, a number in .
The probability function can take as argument subsets of the sample space itself, as in the coin toss example, where the function was defined so that P(heads) = 0.5 and P(tails) = 0.5. However, because of the widespread use of random variables, which transform the sample space into a set of numbers (e.g., , ), it is more common to study probability distributions whose argument are subsets of these particular kinds of sets (number sets),[6] and all probability distributions discussed in this article are of this type. It is common to denote as the probability that a certain value of the variable belongs to a certain event .[7][8]
The above probability function only characterizes a probability distribution if it satisfies all the Kolmogorov axioms, that is:
, so the probability is non-negative
, so no probability exceeds
for any countable disjoint family of sets
The concept of probability function is made more rigorous by defining it as the element of a probability space, where is the set of possible outcomes, is the set of all subsets whose probability can be measured, and is the probability function, or probability measure, that assigns a probability to each of these measurable subsets .[9]
Probability distributions usually belong to one of two classes. A discrete probability distribution is applicable to the scenarios where the set of possible outcomes is discrete (e.g. a coin toss, a roll of a die) and the probabilities are encoded by a discrete list of the probabilities of the outcomes; in this case the discrete probability distribution is known as probability mass function. On the other hand, absolutely continuous probability distributions are applicable to scenarios where the set of possible outcomes can take on values in a continuous range (e.g. real numbers), such as the temperature on a given day. In the absolutely continuous case, probabilities are described by a probability density function, and the probability distribution is by definition the integral of the probability density function.[7][4][8] The normal distribution is a commonly encountered absolutely continuous probability distribution. More complex experiments, such as those involving stochastic processes defined in continuous time, may demand the use of more general probability measures.
A probability distribution whose sample space is one-dimensional (for example real numbers, list of labels, ordered labels or binary) is called univariate, while a distribution whose sample space is a vector space of dimension 2 or more is called multivariate. A univariate distribution gives the probabilities of a single random variable taking on various different values; a multivariate distribution (a joint probability distribution) gives the probabilities of a random vector – a list of two or more random variables – taking on various combinations of values. Important and commonly encountered univariate probability distributions include the binomial distribution, the hypergeometric distribution, and the normal distribution. A commonly encountered multivariate distribution is the multivariate normal distribution.
Besides the probability function, the cumulative distribution function, the probability mass function and the probability density function, the moment generating function and the characteristic function also serve to identify a probability distribution, as they uniquely determine an underlying cumulative distribution function.[10]
Terminology
Some key concepts and terms, widely used in the literature on the topic of probability distributions, are listed below.[1]
Basic terms
Random variable: takes values from a sample space; probabilities describe which values and set of values are taken more likely.
Event: set of possible values (outcomes) of a random variable that occurs with a certain probability.
Probability function or probability measure: describes the probability that the event occurs.[11]
Cumulative distribution function: function evaluating the probability that will take a value less than or equal to for a random variable (only for real-valued random variables).
Quantile function: the inverse of the cumulative distribution function. Gives such that, with probability , will not exceed .
Discrete probability distributions
Discrete probability distribution: for many random variables with finitely or countably infinitely many values.
Probability mass function (pmf): function that gives the probability that a discrete random variable is equal to some value.
Frequency distribution: a table that displays the frequency of various outcomes in a sample.
Absolutely continuous probability distribution: for many random variables with uncountably many values.
Probability density function (pdf) or probability density: function whose value at any given sample (or point) in the sample space (the set of possible values taken by the random variable) can be interpreted as providing a relative likelihood that the value of the random variable would equal that sample.
Related terms
Support: set of values that can be assumed with non-zero probability (or probability density in the case of a continuous distribution) by the random variable. For a random variable , it is sometimes denoted as .
Tail:[12] the regions close to the bounds of the random variable, if the pmf or pdf are relatively low therein. Usually has the form , or a union thereof.
Head:[12] the region where the pmf or pdf is relatively high. Usually has the form .
Expected value or mean: the weighted average of the possible values, using their probabilities as their weights; or the continuous analog thereof.
Median: the value such that the set of values less than the median, and the set greater than the median, each have probabilities no greater than one-half.
Mode: for a discrete random variable, the value with highest probability; for an absolutely continuous random variable, a location at which the probability density function has a local peak.
Variance: the second moment of the pmf or pdf about the mean; an important measure of the dispersion of the distribution.
Standard deviation: the square root of the variance, and hence another measure of dispersion.
Symmetry: a property of some distributions in which the portion of the distribution to the left of a specific value (usually the median) is a mirror image of the portion to its right.
Skewness: a measure of the extent to which a pmf or pdf "leans" to one side of its mean. The third standardized moment of the distribution.
Kurtosis: a measure of the "fatness" of the tails of a pmf or pdf. The fourth standardized moment of the distribution.
Cumulative distribution function
In the special case of a real-valued random variable, the probability distribution can equivalently be represented by a cumulative distribution function instead of a probability measure. The cumulative distribution function of a random variable with regard to a probability distribution is defined as
The cumulative distribution function of any real-valued random variable has the properties:
Conversely, any function that satisfies the first four of the properties above is the cumulative distribution function of some probability distribution on the real numbers.[13]
A discrete probability distribution is the probability distribution of a random variable that can take on only a countable number of values[15] (almost surely)[16] which means that the probability of any event can be expressed as a (finite or countably infinite) sum:
where is a countable set with . Thus the discrete random variables (i.e. random variables whose probability distribution is discrete) are exactly those with a probability mass function. In the case where the range of values is countably infinite, these values have to decline to zero fast enough for the probabilities to add up to 1. For example, if for , the sum of probabilities would be .
A real-valued discrete random variable can equivalently be defined as a random variable whose cumulative distribution function increases only by jump discontinuities—that is, its cdf increases only where it "jumps" to a higher value, and is constant in intervals without jumps. The points where jumps occur are precisely the values which the random variable may take.
Thus the cumulative distribution function has the form
The points where the cdf jumps always form a countable set; this may be any countable set and thus may even be dense in the real numbers.
Dirac delta representation
A discrete probability distribution is often represented with Dirac measures, the probability distributions of deterministic random variables. For any outcome , let be the Dirac measure concentrated at . Given a discrete probability distribution, there is a countable set with and a probability mass function . If is any event, then
or in short,
It follows that the probability that takes any value except for is zero, and thus one can write as
except on a set of probability zero, where is the indicator function of . This may serve as an alternative definition of discrete random variables.
One-point distribution
A special case is the discrete distribution of a random variable that can take on only one fixed value; in other words, it is a deterministic distribution. Expressed formally, the random variable has a one-point distribution if it has a possible outcome such that [18] All other possible outcomes then have probability 0. Its cumulative distribution function jumps immediately from 0 to 1.
An absolutely continuous probability distribution is a probability distribution on the real numbers with uncountably many possible values, such as a whole interval in the real line, and where the probability of any event can be expressed as an integral.[19] More precisely, a real random variable has an absolutely continuous probability distribution if there is a function such that for each interval the probability of belonging to is given by the integral of over :[20][21]
This is the definition of a probability density function, so that absolutely continuous probability distributions are exactly those with a probability density function.
In particular, the probability for to take any single value (that is, ) is zero, because an integral with coinciding upper and lower limits is always equal to zero.
If the interval is replaced by any measurable set , the according equality still holds:
An absolutely continuous random variable is a random variable whose probability distribution is absolutely continuous.
Absolutely continuous probability distributions as defined above are precisely those with an absolutely continuous cumulative distribution function.
In this case, the cumulative distribution function has the form
where is a density of the random variable with regard to the distribution .
Note on terminology: Absolutely continuous distributions ought to be distinguished from continuous distributions, which are those having a continuous cumulative distribution function. Every absolutely continuous distribution is a continuous distribution but the inverse is not true, there exist singular distributions, which are neither absolutely continuous nor discrete nor a mixture of those, and do not have a density. An example is given by the Cantor distribution. Some authors however use the term "continuous distribution" to denote all distributions whose cumulative distribution function is absolutely continuous, i.e. refer to absolutely continuous distributions as continuous distributions.[7]
For a more general definition of density functions and the equivalent absolutely continuous measures see absolutely continuous measure.
Absolutely continuous and discrete distributions with support on or are extremely useful to model a myriad of phenomena,[7][5] since most practical distributions are supported on relatively simple subsets, such as hypercubes or balls. However, this is not always the case, and there exist phenomena with supports that are actually complicated curves within some space or similar. In these cases, the probability distribution is supported on the image of such curve, and is likely to be determined empirically, rather than finding a closed formula for it.[25]
One example is shown in the figure to the right, which displays the evolution of a system of differential equations (commonly known as the Rabinovich–Fabrikant equations) that can be used to model the behaviour of Langmuir waves in plasma.[26] When this phenomenon is studied, the observed states from the subset are as indicated in red. So one could ask what is the probability of observing a state in a certain position of the red subset; if such a probability exists, it is called the probability measure of the system.[27][25]
This kind of complicated support appears quite frequently in dynamical systems. It is not simple to establish that the system has a probability measure, and the main problem is the following. Let be instants in time and a subset of the support; if the probability measure exists for the system, one would expect the frequency of observing states inside set would be equal in interval and , which might not happen; for example, it could oscillate similar to a sine, , whose limit when does not converge. Formally, the measure exists only if the limit of the relative frequency converges when the system is observed into the infinite future.[28] The branch of dynamical systems that studies the existence of a probability measure is ergodic theory.
Note that even in these cases, the probability distribution, if it exists, might still be termed "absolutely continuous" or "discrete" depending on whether the support is uncountable or countable, respectively.
Most algorithms are based on a pseudorandom number generator that produces numbers that are uniformly distributed in the half-open interval[0, 1). These random variates are then transformed via some algorithm to create a new random variate having the required probability distribution. With this source of uniform pseudo-randomness, realizations of any random variable can be generated.[29]
For example, suppose has a uniform distribution between 0 and 1. To construct a random Bernoulli variable for some , we define
so that
This random variable X has a Bernoulli distribution with parameter .[29] This is a transformation of discrete random variable.
For a distribution function of an absolutely continuous random variable, an absolutely continuous random variable must be constructed. , an inverse function of , relates to the uniform variable :
For example, suppose a random variable that has an exponential distribution must be constructed.
so and if has a distribution, then the random variable is defined by . This has an exponential distribution of .[29]
The concept of the probability distribution and the random variables which they describe underlies the mathematical discipline of probability theory, and the science of statistics. There is spread or variability in almost any value that can be measured in a population (e.g. height of people, durability of a metal, sales growth, traffic flow, etc.); almost all measurements are made with some intrinsic error; in physics, many processes are described probabilistically, from the kinetic properties of gases to the quantum mechanical description of fundamental particles. For these and many other reasons, simple numbers are often inadequate for describing a quantity, while probability distributions are often more appropriate.
The following is a list of some of the most common probability distributions, grouped by the type of process that they are related to. For a more complete list, see list of probability distributions, which groups by the nature of the outcome being considered (discrete, absolutely continuous, multivariate, etc.)
All of the univariate distributions below are singly peaked; that is, it is assumed that the values cluster around a single point. In practice, actually observed quantities may cluster around multiple values. Such quantities can be modeled using a mixture distribution.
Linear growth (e.g. errors, offsets)
Normal distribution (Gaussian distribution), for a single such quantity; the most commonly used absolutely continuous distribution
Bernoulli trials (yes/no events, with a given probability)
Basic distributions:
Bernoulli distribution, for the outcome of a single Bernoulli trial (e.g. success/failure, yes/no)
Binomial distribution, for the number of "positive occurrences" (e.g. successes, yes votes, etc.) given a fixed total number of independent occurrences
Negative binomial distribution, for binomial-type observations but where the quantity of interest is the number of failures before a given number of successes occurs
Gamma distribution, for the time before the next k Poisson-type events occur
Absolute values of vectors with normally distributed components
Rayleigh distribution, for the distribution of vector magnitudes with Gaussian distributed orthogonal components. Rayleigh distributions are found in RF signals with Gaussian real and imaginary components.
Rice distribution, a generalization of the Rayleigh distributions for where there is a stationary background signal component. Found in Rician fading of radio signals due to multipath propagation and in MR images with noise corruption on non-zero NMR signals.
Normally distributed quantities operated with sum of squares
In quantum mechanics, the probability density of finding the particle at a given point is proportional to the square of the magnitude of the particle's wavefunction at that point (see Born rule). Therefore, the probability distribution function of the position of a particle is described by , probability that the particle's position x will be in the interval a ≤ x ≤ b in dimension one, and a similar triple integral in dimension three. This is a key principle of quantum mechanics.[31]
Probabilistic load flow in power-flow study explains the uncertainties of input variables as probability distribution and provides the power flow calculation also in term of probability distribution.[32]
Probability distribution fitting or simply distribution fitting is the fitting of a probability distribution to a series of data concerning the repeated measurement of a variable phenomenon.
The aim of distribution fitting is to predict the probability or to forecast the frequency of occurrence of the magnitude of the phenomenon in a certain interval.
There are many probability distributions (see list of probability distributions) of which some can be fitted more closely to the observed frequency of the data than others, depending on the characteristics of the phenomenon and of the distribution. The distribution giving a close fit is supposed to lead to good predictions.
In distribution fitting, therefore, one needs to select a distribution that suits the data well.
^ abEveritt, Brian (2006). The Cambridge dictionary of statistics (3rd ed.). Cambridge, UK: Cambridge University Press. ISBN978-0-511-24688-3. OCLC161828328.
^Ash, Robert B. (2008). Basic probability theory (Dover ed.). Mineola, N.Y.: Dover Publications. pp. 66–69. ISBN978-0-486-46628-6. OCLC190785258.
^ abEvans, Michael; Rosenthal, Jeffrey S. (2010). Probability and statistics: the science of uncertainty (2nd ed.). New York: W.H. Freeman and Co. p. 38. ISBN978-1-4292-2462-8. OCLC473463742.
^ abDekking, Michel (1946–) (2005). A Modern Introduction to Probability and Statistics : Understanding why and how. London, UK: Springer. ISBN978-1-85233-896-1. OCLC262680588.{{cite book}}: CS1 maint: numeric names: authors list (link)
^Walpole, R.E.; Myers, R.H.; Myers, S.L.; Ye, K. (1999). Probability and statistics for engineers. Prentice Hall.
^ abcdRoss, Sheldon M. (2010). A first course in probability. Pearson.
^ abDeGroot, Morris H.; Schervish, Mark J. (2002). Probability and Statistics. Addison-Wesley.
^Billingsley, P. (1986). Probability and measure. Wiley. ISBN9780471804789.
^Cohn, Donald L. (1993). Measure theory. Birkhäuser.
^Khuri, André I. (March 2004). "Applications of Dirac's delta function in statistics". International Journal of Mathematical Education in Science and Technology. 35 (2): 185–195. doi:10.1080/00207390310001638313. ISSN0020-739X. S2CID122501973.
^Fisz, Marek (1963). Probability Theory and Mathematical Statistics (3rd ed.). John Wiley & Sons. p. 129. ISBN0-471-26250-1.
^Jeffrey Seth Rosenthal (2000). A First Look at Rigorous Probability Theory. World Scientific.
^W., Stroock, Daniel (1999). Probability theory : an analytic view (Rev. ed.). Cambridge [England]: Cambridge University Press. p. 11. ISBN978-0521663496. OCLC43953136.{{cite book}}: CS1 maint: multiple names: authors list (link)
^Kolmogorov, Andrey (1950) [1933]. Foundations of the theory of probability. New York, USA: Chelsea Publishing Company. pp. 21–24.
^Joyce, David (2014). "Axioms of Probability"(PDF). Clark University. Retrieved December 5, 2019.
^ abAlligood, K.T.; Sauer, T.D.; Yorke, J.A. (1996). Chaos: an introduction to dynamical systems. Springer.
^Rabinovich, M.I.; Fabrikant, A.L. (1979). "Stochastic self-modulation of waves in nonequilibrium media". J. Exp. Theor. Phys. 77: 617–629. Bibcode:1979JETP...50..311R.
^Walters, Peter (2000). An Introduction to Ergodic Theory. Springer.
^ abcDekking, Frederik Michel; Kraaikamp, Cornelis; Lopuhaä, Hendrik Paul; Meester, Ludolf Erwin (2005), "Why probability and statistics?", A Modern Introduction to Probability and Statistics, Springer London, pp. 1–11, doi:10.1007/1-84628-168-7_1, ISBN978-1-85233-896-1
^Bishop, Christopher M. (2006). Pattern recognition and machine learning. New York: Springer. ISBN0-387-31073-8. OCLC71008143.
^Chang, Raymond. (2014). Physical chemistry for the chemical sciences. Thoman, John W., Jr., 1960-. [Mill Valley, California]. pp. 403–406. ISBN978-1-68015-835-9. OCLC927509011.{{cite book}}: CS1 maint: location missing publisher (link)
^Chen, P.; Chen, Z.; Bak-Jensen, B. (April 2008). "Probabilistic load flow: A review". 2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. pp. 1586–1591. doi:10.1109/drpt.2008.4523658. ISBN978-7-900714-13-8. S2CID18669309.
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Río San Juan Nacimiento del río San Juan en Castillo de LocubínUbicación geográficaCuenca GuadalquivirDesembocadura Río GuadajozCoordenadas 37°31′56″N 4°06′02″O / 37.532222222222, -4.1005555555556Ubicación administrativaPaís España EspañaComunidad autónoma Andalucía AndalucíaProvincia Córdoba CórdobaJaén JaénCuerpo de aguaLongitud 36,6 km[1]Superficie de cuenca 233,4 km²[1][editar datos en Wikidata] El rí...
У этого термина существуют и другие значения, см. Загорье. СелоЗагорье 57°01′43″ с. ш. 38°20′58″ в. д.HGЯO Страна Россия Субъект Федерации Ярославская область Муниципальный район Переславский Сельское поселение Нагорьевское История и география Первое упоминани�...
Acrobatic exercise For other uses, see Somersault (disambiguation). This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Somersault – news · newspapers · books · scholar · JSTOR (February 2014) (Learn how and when to remove this template message) Front tucked somersault animation A somersault (also flip, heli, an...