Formulas and functions > Functions from A to Z > TINV (percentiles of the t-distribution)

Note: TINV is supplemented by the new identical function T.INV.2T and the completely new function T.INV, which are available in newer versions of Microsoft Excel (2010 or later).

Syntax:

TINV(Probability, DegreesFreedom)

Description:

Returns the inverse of the two-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.