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student(t, nu [, /complement])
Returns the value of the statistical Student’s t function at ordinate
t for nu degrees of freedom, or one minus the
t function if /complement is specified.
If r is the sample cross-correlation coefficient of n
value pairs drawn from a bivariate normal distribution, then its
distribution function is equal to student(sqrt((n - 2)*r^2/(1 -
r^2)), n - 2).