| bessel_j0 | Returns the Bessel function of order 0 of the specified number.
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| bessel_j1 | Returns the Bessel function of order 1 of the specified number.
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| bessel_jn | Returns the Bessel function of order n of the specified number.
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| bessel_y0 | Returns the Bessel function of the second kind, of order 0 of the specified number.
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| bessel_y1 | Returns the Bessel function of the second kind, of order 1 of the specified number.
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| bessel_yn | Returns the Bessel function of the second kind, of order n of the specified number.
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| chisq | Returns the area under the left hand tail (from 0 to x)
of the Chi square probability density function with v degrees of freedom.
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| chisqc | Returns the area under the right hand tail (from x to infinity)
of the Chi square probability density function with v degrees of freedom:
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| cumnormal | Returns the area under the Gaussian probability density function, integrated from minus infinity to a.
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| gamma | Returns the gamma function of the specified number.
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| ibeta | Returns the incomplete beta function evaluated from zero to xx.
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| igam | Returns the incomplete gamma function.
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| igamc | Returns the complemented incomplete gamma function.
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| incbcf | Returns the continued fraction expansion #1 for incomplete beta integral.
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| incbd | Returns the continued fraction expansion #2 for incomplete beta integral.
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| p1evl | Evaluates polynomial of degree N with assumtion that coef[N] = 1.0
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| poisson | Returns the sum of the first k terms of the Poisson distribution.
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| poissonc | Returns the sum of the terms k+1 to infinity of the Poisson distribution.
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| polevl | Evaluates polynomial of degree N
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| pseries | Returns the power series for incomplete beta integral. Use when b*x is small and x not too close to 1.
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| stirf | Return the gamma function computed by Stirling's formula.
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