# Noncentral t-distribution (noncentrality) Calculator

## Calculates the noncentrality parameter from the lower or upper cumulative distribution function of the noncentral t-distribution.

cumulative mode
 lower P upper Q
cumulative distribution
 0≦P,Q≦1
percentile x
degree of freedom ν
 ν＞0
 6dgt10dgt14dgt18dgt22dgt26dgt30dgt34dgt38dgt42dgt46dgt50dgt
 $\normal Noncentral\ Student's\ t{\tiny-}distribution\\\hspace{240}t(x,\nu,\lambda)\\[10](1)\ probability\ density\\\ f(x,\nu,\lambda)={\small-}{\large\sum_{\small j=0}^{\small \infty}\frac{e^{-\frac{\lambda}{2}}(\frac{\lambda}{2})^j}{j!}\frac{(\frac{\nu}{\nu+x^2})^{\frac{\nu}{2}}(\frac{x^2}{\nu+x^2})^{\frac{1}{2}+j}}{B(\frac{\nu}{2},\frac{1}{2}+j)}\frac{2}{x}}\\\hspace{75}+{\large\sum_{\small j=\frac{1}{2}}^{\small \infty}\frac{e^{-\frac{\lambda}{2}}(\frac{\lambda}{2})^j}{j!}\frac{(\frac{\nu}{\nu+x^2})^{\frac{\nu}{2}}(\frac{x^2}{\nu+x^2})^{\frac{1}{2}+j}}{B(\frac{\nu}{2},\frac{1}{2}+j)}\frac{2}{x}}\\(2)\ lower\ cumulative\ distribution\\\hspace{25}P(x,\nu,\lambda)={\large\int_{\small-\infty}^{\hspace{25}\small x}}f(t,\nu,\lambda)dt\\(3)\ upper\ cumulative\ distribution\\\hspace{25}Q(x,\nu,\lambda)={\large\int_{\small x}^{\hspace{25pt}\small\infty}}f(t,\nu,\lambda)dt\\$

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