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dehat beta denotes the maximum likelihood estimate and x 1 n i 1 n x i textstyle textstyle bar x frac 1 n sum _ i 1 n x_ i is the sample mean of the observations background and interpretation edit historical remarks edit see also history of statistics and history of probability the term likelihood has been in use in english since at least late middle english 39 its formal use to refer to a specific function in mathematical statistics was proposed by ronald fisher 40 in two research papers published in 1921 41 and 1922 42 the 1921 paper introduced what is today called a likelihood interval the 1922 paper introduced the term method of maximum likelihood quoting fisher i n 1922 i proposed the term likelihood in view of the fact that with respect to the parameter it is not a probability and does not obey the laws of probability while at the same time it bears to the problem of rational choice among the possible values of the parameter a relation similar to that which probability bears to the problem of predicting events in games of chance whereas however in relation to psychological judgment likelihood has some resemblance to probability the two concepts are wholly distinct 43 the concept of likelihood should not be confused with probability as mentioned by sir ronald fisher i stress this because in spite of the emphasis that i have always laid upon the difference between probability and likelihood there is still a tendency to treat likelihood as though it were a sort of probability the first result is thus that there are two different measures of rational belief appropriate to different cases knowing the population we can express our incomplete knowledge of or expectation of the sample in terms of probability knowing the sample we can express our incomplete knowledge of the population in terms of likelihood 44 fisher s invention of statistical likelihood was in reaction against an earlier form of reasoning called inverse probability 45 his use of the term likelihood fixed the meaning of the term within mathematical statistics a w f edwards 1972 established the axiomatic basis for use of the log likelihood ratio as a measure of relative support for one hypothesis against another the support function is then the natural logarithm of the likelihood function both terms are used in phylogenetics but were not adopted in a general treatment of the topic of statistical evidence 46 interpretations under different foundations edit among statisticians there is no consensus about what the foundation of statistics should be there are four main paradigms that have been proposed for the foundation frequentism bayesianism likelihoodism and aic based 47 for each of the proposed foundations the interpretation of likelihood is different the four interpretations are described in the subsections below frequentist interpretation edit this section is empty you can help by adding to it march 2019 bayesian interpretation edit in bayesian inference although one can speak about the likelihood of any proposition or random variable given another random variable for example the likelihood of a parameter value or of a statistical model see marginal likelihood given specified data or other evidence 48 49 50 51 the likelihood function remains the same entity with the additional interpretations of i a conditional density of the data given the parameter since the parameter is then a random variable and ii a measure or amount of information brought by the data about the parameter value or even the model 48 49 50 51 52 due to the introduction of a probability structure on the parameter space or on the collection of models it is possible that a parameter value or a statistical model have a large likelihood value for given data and yet have a low probability or vice versa 50 52 this is often the case in medical contexts 53 following bayes rule the likelihood when seen as a conditional density can be multiplied by the prior probability density of the parameter and then normalized to give a posterior probability density 48 49 50 51 52 more generally the likelihood of an unknown quantity x textstyle x given another unknown quantity y textstyle y is proportional to the probability of y textstyle y given x textstyle x 48 49 50 51 52 likelihoodist interpretation edit this section includes a list of general references but lacks sufficient corresponding inline citations please help improve this section by introducing more precise citations april 2019 learn how and when to remove this message in frequentist statistics the likelihood function is itself a statistic that summarizes a single sample from a population whose calculated value depends on a choice of several parameters θ 1 θ p where p is the count of parameters in some already selected statistical model the value of the likelihood serves as a figure of merit for the choice used for the parameters and the parameter set with maximum likelihood is the best choice given the data available the specific calculation of the likelihood is the probability that the observed sample would be assigned assuming that the model chosen and the values of the several parameters θ give an accurate approximation of the frequency distribution of the population that the observed sample was drawn from heuristically it makes sense that a good choice of parameters is those which render the sample actually observed the maximum possible post hoc probability of having happened wilks theorem quantifies the heuristic rule by showing that the difference in the logarithm of the likelihood generated by the estimate s parameter values and the logarithm of the likelihood generated by population s true but unknown parameter values is asymptotically χ 2 distributed each independent sample s maximum likelihood estimate is a separate estimate of the true parameter set describing the population sampled successive estimates from many independent samples will cluster together with the population s true set of parameter values hidden somewhere in their midst the difference in the logarithms of the maximum likelihood and adjacent parameter sets likelihoods may be used to draw a confidence region on a plot whose co ordinates are the parameters θ 1 θ p the region surrounds the maximum likelihood estimate and all points parameter sets within that region differ at most in log likelihood by some fixed value the χ 2 distribution given by wilks theorem converts the region s log likelihood differences into the confidence that the population s true parameter set lies inside the art of choosing the fixed log likelihood difference is to make the confidence acceptably high while keeping the region acceptably small narrow range of estimates as more data are observed instead of being used to make independent estimates they can be combined with the previous samples to make a single combined sample and that large sample may be used for a new maximum likelihood estimate as the size of the combined sample increases the size of the likelihood region with the same confidence shrinks eventually either the size of the confidence region is very nearly a single point or the entire population has been sampled in both cases the estimated parameter set is essentially the same as the population parameter set aic based interpretation edit this section needs expansion you can help by adding missing information march 2019 under the aic paradigm likelihood is interpreted within the context of information theory 54 55 56 see also edit bayes factor conditional entropy conditional probability empirical likelihood likelihood principle likelihood ratio test likelihoodist statistics maximum likelihood estimation principle of maximum entropy pseudolikelihood score statistics notes edit see exponential family interpretation references edit zellner arnold 1971 an introduction to bayesian inference in econometrics new york wiley pp 13 14 isbn 0 471 98165 6 billingsley patrick 1995 probability and measure third ed john wiley sons pp 422 423 shao jun 2003 mathematical statistics 2nd ed springer 4 4 1 gouriéroux christian monfort alain 1995 statistics and econometric models new york cambridge university press p 161 isbn 0 521 40551 3 mäkeläinen timo schmidt klaus styan george p h 1981 on the existence and uniqueness of the maximum likelihood estimate of a vector valued parameter in fixed size samples annals of statistics 9 4 758 767 doi 10 1214 aos 1176345516 jstor 2240844 mascarenhas w f 2011 a mountain pass lemma and its implications regarding the uniqueness of constrained minimizers optimization 60 8 9 1121 1159 doi 10 1080 02331934 2010 527973 s2cid 15896597 chanda k c 1954 a note on the consistency and maxima of the roots of likelihood equations biometrika 41 1 2 56 61 doi 10 2307 2333005 jstor 2333005 greenberg edward webster charles e jr 1983 advanced econometrics a bridge to the literature new york ny john wiley sons pp 24 25 isbn 0 471 09077 8 heyde c c johnstone i m 1979 on asymptotic 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2000 statistical inference in science springer chap 2 davison a c 2008 statistical models cambridge university press 4 1 2 held l sabanés bové d s 2014 applied statistical inference likelihood and bayes springer 2 1 1 2 3 rossi r j 2018 mathematical statistics wiley p 267 1 2 hudson d j 1971 interval estimation from the likelihood function journal of the royal statistical society series b 33 2 256 262 doi 10 1111 j 2517 6161 1971 tb00877 x pawitan yudi 2001 in all likelihood statistical modelling and inference using likelihood oxford university press isbn 978 0 19 850765 9 wen hsiang wei generalized linear model course notes taichung taiwan tunghai university pp chapter 5 retrieved 2017 10 01 amemiya takeshi 1985 concentrated likelihood function advanced econometrics cambridge harvard university press pp 125 127 isbn 978 0 674 00560 0 davidson russell mackinnon james g 1993 concentrating the loglikelihood function estimation and inference in econometrics new york oxford university press pp 267 269 isbn 978 0 19 506011 9 gourieroux christian monfort alain 1995 concentrated likelihood function statistics and econometric models new york cambridge university press pp 170 175 isbn 978 0 521 40551 5 pickles andrew 1985 an introduction to likelihood analysis norwich w h hutchins sons pp 21 24 isbn 0 86094 190 6 bolker benjamin m 2008 ecological models and data in r princeton university press pp 187 189 isbn 978 0 691 12522 0 aitkin murray 1982 direct likelihood inference glim 82 proceedings of the international conference on generalised linear models springer pp 76 86 isbn 0 387 90777 7 venzon d j moolgavkar s h 1988 a method for computing profile likelihood based confidence intervals journal of the royal statistical society series c applied statistics 37 1 87 94 doi 10 2307 2347496 jstor 2347496 kalbfleisch j d sprott d a 1973 marginal and conditional likelihoods sankhyā the indian journal of statistics series a 35 3 311 328 jstor 25049882 cox d r 1975 partial 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and methods 11 13 1505 1510 doi 10 1080 03610928208828325 rao b raja 1960 a formula for the curvature of the likelihood surface of a sample drawn from a distribution admitting sufficient statistics biometrika 47 1 2 203 207 doi 10 1093 biomet 47 1 2 203 ward michael d ahlquist john s 2018 maximum likelihood for social science strategies for analysis cambridge university press pp 25 27 likelihood shorter oxford english dictionary 2007 hald a 1999 on the history of maximum likelihood in relation to inverse probability and least squares statistical science 14 2 214 222 doi 10 1214 ss 1009212248 jstor 2676741 fisher r a 1921 on the probable error of a coefficient of correlation deduced from a small sample metron 1 3 32 fisher r a 1922 on the mathematical foundations of theoretical statistics philosophical transactions of the royal society a 222 594 604 309 368 bibcode 1922rspta 222 309f doi 10 1098 rsta 1922 0009 hdl 2440 15172 jfm 48 1280 02 jstor 91208 klemens ben 2008 modeling with data tools and techniques for scientific computing princeton university press p 329 fisher ronald 1930 inverse probability mathematical proceedings of the cambridge philosophical society 26 4 528 535 bibcode 1930pcps 26 528f doi 10 1017 s0305004100016297 hdl 2440 15206 fienberg stephen e 1997 introduction to r a fisher on inverse probability and likelihood statistical science 12 3 161 doi 10 1214 ss 1030037905 royall r 1997 statistical evidence chapman hall bandyopadhyay p s forster m r eds 2011 philosophy of statistics north holland publishing 1 2 3 4 i j good probability and the weighing of evidence griffin 1950 6 1 1 2 3 4 h jeffreys theory of probability 3rd ed oxford university press 1983 1 22 1 2 3 4 5 e t jaynes probability theory the logic of science cambridge university press 2003 4 1 1 2 3 4 d v lindley introduction to probability and statistics from a bayesian viewpoint part 1 probability cambridge university press 1980 1 6 1 2 3 4 a gelman j b carlin h s stern d b dunson a vehtari d b rubin bayesian data ana...
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