--  T.DIST    returns the Student's left-tailed t-distribution
--  T.DIST.2T returns the two-tailed Student's t-distribution
--  T.DIST.RT returns the right-tailed Student's t-distribution
--
--      T.DIST ( Value, DegFreedom, Cumulative )
--
--  https://en.wikipedia.org/wiki/Student%27s_t-distribution
DEFINE
    VAR Vals            = GENERATESERIES ( 0, 5, 0.25 )
    VAR DegFreedom      = 4.6
    VAR CumulativeTrue  = TRUE   -- Cumulative distribution function
    VAR CumulativeFalse = FALSE  -- Probability density function
EVALUATE
ADDCOLUMNS ( 
    Vals, 
    "T Dist",            -- Probability density function
        FORMAT ( 
            T.DIST ( [Value], DegFreedom, CumulativeFalse ),
            "#,0.0####"
        ),
    "T Dist Cumulative", -- Cumulative distribution function
        FORMAT ( 
            T.DIST ( [Value], DegFreedom, CumulativeTrue ),
            "#,0.0####"
        ),
    "2T Dist",            -- Probability density function
        FORMAT ( 
            T.DIST.2T ( [Value], DegFreedom ),
            "#,0.0####"
        ),
    "RT Dist", -- Cumulative distribution function
        FORMAT ( 
            T.DIST.RT ( [Value], DegFreedom ),
            "#,0.0####"
        )
    )