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Дата изменения: Wed Jun 28 23:12:27 2006
Дата индексирования: Sat Dec 22 08:35:07 2007
Кодировка:

Поисковые слова: п п п п п п п п п п п
Integrated Gaussian probability XMM-Newton SAS Home Page
XMM-Newton Science Analysis System


ssclib (ssclib-3.29) [xmmsas_20060628_1801-7.0.0]

Parallel detection over bands Poissonian statistics and source `Degrees of freedom' for Home Index

Meta Index / Home Page / Poissonian statistics and source

Integrated Gaussian probability

This function returns the probability that a gaussian-distributed variable $y$ will depart from the mean $y_{\rm {mean}}$ by greater than $abs(y-y_{\rm {mean}})$. For values obeying a gaussian distribution of standard deviation $\sigma$, the probability $P$ of a given $y$ value (or greater) occurring by chance is


\begin{displaymath}
P(y) = 1 - erf \big[ abs(y - y_{\rm {mean}})/\sigma\sqrt{2} \big].
\end{displaymath}

  function integratedGaussProb(testY, meanY, sigma) result(probability)
    real(single), intent(in) :: testY, meanY, sigma
    real(single) :: probability
  end function integratedGaussProb



XMM-Newton SOC/SSC -- 2006-06-28