Models of DNA evolution: Difference between revisions
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{{Probability distribution| | |||
name =Half-logistic distribution| | |||
type =density| | |||
pdf_image =[[Image:Half-logistic distribution pdf.svg|325px|Probability density plots of half-logistic distribution]]| | |||
cdf_image =[[Image:Half-logistic distribution cdf.svg|325px|Cumulative distribution plots of half-logistic distribution]]| | |||
parameters =| | |||
support =<math>k \in [0;\infty)\!</math>| | |||
pdf =<math>\frac{2 e^{-k}}{(1+e^{-k})^2}\!</math>| | |||
cdf =<math>\frac{1-e^{-k}}{1+e^{-k}}\!</math>| | |||
mean =<math>\log_e(4)=1.386\ldots</math>| | |||
median =<math>\log_e(3)=1.0986\ldots</math>| | |||
mode =0| | |||
variance =<math>\pi^2/3-(\log_e(4))^2=1.368\ldots</math>| | |||
skewness =| | |||
kurtosis =| | |||
entropy =| | |||
mgf =| | |||
char =| | |||
}} | |||
In [[probability theory]] and [[statistics]], the '''half-logistic distribution''' is a continuous [[probability distribution]]—the distribution of the absolute value of a [[random variable]] following the [[logistic distribution]]. That is, for | |||
:<math>X = |Y| \!</math> | |||
where ''Y'' is a logistic random variable, ''X'' is a half-logistic random variable. | |||
== Specification == | |||
=== Cumulative distribution function === | |||
The [[cumulative distribution function]] (cdf) of the half-logistic distribution is intimately related to the cdf of the logistic distribution. Formally, if ''F''(''k'') is the cdf for the logistic distribution, then ''G''(''k'') = 2''F''(''k'') − 1 is the cdf of a half-logistic distribution. Specifically, | |||
:<math>G(k) = \frac{1-e^{-k}}{1+e^{-k}} \mbox{ for } k\geq 0. \!</math> | |||
=== Probability density function === | |||
Similarly, the [[probability density function]] (pdf) of the half-logistic distribution is ''g''(''k'') = 2''f''(''k'') if ''f''(''k'') is the pdf of the logistic distribution. Explicitly, | |||
:<math>g(k) = \frac{2 e^{-k}}{(1+e^{-k})^2} \mbox{ for } k\geq 0. \!</math> | |||
==References== | |||
*{{cite book | last = George | first = Olusengun | coauthors = Meenakshi Devidas | editor = N. Balakrishnan | title = Handbook of the Logistic Distribution | year = 1992 | publisher = Marcel Dekker, Inc. | location = New York | pages = 232–234 | chapter = Some Related Distributions | isbn = 0-8247-8587-8}} | |||
*{{cite journal | first = A.K. | last = Olapade |date=February 2003 | title = On Characterizations of the Half-Logistic Distribution | journal = InterStat, | issue = 2 | url = http://interstat.statjournals.net/YEAR/2003/articles/0302002.pdf}} | |||
{{ProbDistributions|half-logistic distribution}} | |||
[[Category:Continuous distributions]] | |||
[[Category:Probability distributions]] |
Revision as of 17:47, 24 December 2013
Template:Probability distribution
In probability theory and statistics, the half-logistic distribution is a continuous probability distribution—the distribution of the absolute value of a random variable following the logistic distribution. That is, for
where Y is a logistic random variable, X is a half-logistic random variable.
Specification
Cumulative distribution function
The cumulative distribution function (cdf) of the half-logistic distribution is intimately related to the cdf of the logistic distribution. Formally, if F(k) is the cdf for the logistic distribution, then G(k) = 2F(k) − 1 is the cdf of a half-logistic distribution. Specifically,
Probability density function
Similarly, the probability density function (pdf) of the half-logistic distribution is g(k) = 2f(k) if f(k) is the pdf of the logistic distribution. Explicitly,
References
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