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

Syntax:

T.INV(Probability, DegreesFreedom)

Description:

This 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. The values must be within the range 0 to 1.

DegreesFreedom is the number of degrees of freedom. This value must be ≥ 1. Integers are expected; if this is not the case, PlanMaker automatically truncates the decimal places.

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

Note:

The T.INV and T.INV.2T functions supplement 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. The function is unknown in older versions.