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### 7.15.4 Probability functions

The probability functions for the Normal or Gaussian distribution are described in Abramowitz & Stegun, Section 26.2.

Function: double gsl_sf_erf_Z (double x)
Function: int gsl_sf_erf_Z_e (double x, gsl_sf_result * result)

These routines compute the Gaussian probability density function Z(x) = (1/\sqrt{2\pi}) \exp(-x^2/2).

Function: double gsl_sf_erf_Q (double x)
Function: int gsl_sf_erf_Q_e (double x, gsl_sf_result * result)

These routines compute the upper tail of the Gaussian probability function Q(x) = (1/\sqrt{2\pi}) \int_x^\infty dt \exp(-t^2/2).

The hazard function for the normal distribution, also known as the inverse Mill's ratio, is defined as, It decreases rapidly as x approaches -\infty and asymptotes to h(x) \sim x as x approaches +\infty.

Function: double gsl_sf_hazard (double x)
Function: int gsl_sf_hazard_e (double x, gsl_sf_result * result)

These routines compute the hazard function for the normal distribution.

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