

   TThhee SSttuuddeenntt tt DDiissttrriibbuuttiioonn

        dt(x, df)
        pt(q, df)
        qt(p, df)
        rt(n, df)

   DDeessccrriippttiioonn::

        These functions provide information about the t distri-
        bution with `df' degrees of freedom.  `dt' gives the
        density, `pt' gives the distribution function, `qt'
        gives the quantile function and `rt' generates random
        deviates.

        The t distribution with n degrees of freedom has den-
        sity

        f(x) = Gamma((n+1)/2) / (sqrt(n pi) Gamma(n/2)) (1 + x^2/n)^-((n+1)/2)

        for all real x.

   SSeeee AAllssoo::

        `df' for the F distribution which generalizes the t
        one.

   EExxaammpplleess::

        1 - pt(1:5, df = 1)
        qt(.975, df = c(1:10,20,50,100,1000))

