Functional renormalization group

In mathematics, Owen's T function T(h, a), named after statistician Donald Bruce Owen, is defined by

$T(h,a)={\frac {1}{2\pi }}\int _{0}^{a}{\frac {e^{-{\frac {1}{2}}h^{2}(1+x^{2})}}{1+x^{2}}}dx\quad \left(-\infty <h,a<+\infty \right).$

Applications

The function T(h, a) gives the probability of the event (X>h and 0<Y<a*X) where X and Y are independent standard normal random variables.

This function can be used to calculate bivariate normal distribution probabilities and, from there, in the calculation of multivariate normal distribution probabilities. It also frequently appears in various integrals involving Gaussian functions.

Computer algorithms for the accurate calculation of this function are available. The function was first introduced by Owen in 1956.

Properties

$T(h,0)=0$

$T(0,a)={\frac {1}{2\pi }}\arctan(a)$

$T(-h,a)=T(h,a)$

$T(h,-a)=-T(h,a)$

$T(h,a)+T(ah,{\frac {1}{a}})={\frac {1}{2}}\left(\Phi (h)+\Phi (ah)\right)+\Phi (h)\Phi (ah)\quad {\mbox{if}}\quad a\geq 0$

$T(h,a)+T(ah,{\frac {1}{a}})={\frac {1}{2}}\left(\Phi (h)+\Phi (ah)\right)+\Phi (h)\Phi (ah)-{\frac {1}{2}}\quad {\mbox{if}}\quad a<0$

$T(h,1)={\frac {1}{2}}\Phi (h)\left(1-\Phi (h)\right)$

$\int T(0,x)\mathrm {d} x=xT(0,x)-{\frac {1}{4\pi }}\ln(1+x^{2})+C$

More properties can be found in the literature.

References

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Software

• Owen's T function (user web site) - offers C++, FORTRAN77, FORTRAN90, and MATLAB libraries released under the LGPL license LGPL
• Owen's T-function is implemented in Mathematica since version 8, as OwenT.

External links

• Why You Should Care about the Obscure (Wolfram blog post)

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