Formulas and functions > Functions from A to Z > T.INV (percentiles of the t-distribution left-tailed)

Syntax:

T.INV(Probability, DegreesFreedom)

Description:

Returns the inverse of the left-tailed Student's t-distribution function (i.e., percentiles of this distribution).

Probability is the two-tailed probability to be evaluated. Must be in the range 0 to 1.

DegreesFreedom is the number of degrees of freedom. Must be ≥ 1. Integer numbers are expected. Digits to the right of the decimal point are ignored.

Please note: The result of this function is calculated using an iterative search technique. If PlanMaker does not find a result after 100 iterations that deviates less than ±3x10^-7 from Probability, it displays the error value #N/A and aborts the approximation.

Note:

The T.INV function supplements together with T.INV.2T the previous TINV function.

T.INV.2T returns the same result as TINV (two-tailed percentiles).

T.INV (left-tailed percentiles) is completely new.

Compatibility notes:

Microsoft Excel supports this function only in version 2010 or later. In older versions, the function is unknown.