TDist

Syntax

TDist(Value, DegreesOfFreedom, Tails)

Parameters

Value. The value, for which the distribution needs to be calculated.

DegreesOfFreedom. An integer that indicates the number of degrees of freedom. The value must satisfy the constraint: DegreesOfFreedom >= 1.

Tails. The number of returned distribution tails. Available values:

1. The TDist function returns one-tailed distribution.
2. The TDist function returns two-tailed distribution.

Description

The method returns the percentage points (probability) for the Student t-distribution, where a numeric value (x) is a calculated value, for which the percentage points are to be computed.

Comments

T-distribution is used to check hypotheses in case of a small sample. This function can be used instead of the table containing critical values of t-distribution.

The function is calculated with the following formula:

TDist = p(x<X),

where:

X. Random value corresponding to t-distribution.