IStatistics.TInv

Syntax

TInv(Probability: Double; DegreesOfFreedom: Integer): Double;

Parameters

Probability. Probability corresponding to two-tailed distribution. Tolerance range: [0; 1];

DegreesOfFreedom. The number of degrees of freedom describing the distribution. Value must satisfy the following constraint: DegreesOfFreedom >= 1.

Description

The TInv method returns the t-value of the Student's distribution as the function of probability and the number of degrees of freedom.

Comments

You can calculate the single-sided t-value be replacing the Probability argument with 2*Probability.

Example

Sub Main;

Var

st: Statistics;

d0: Double;

Begin

st := New Statistics.Create;

d0 := st.TInv(0.004,56);

If st.Status <> 0 Then

Debug.WriteLine(st.Errors);

Else

Debug.WriteLine("t-value: " + d0.ToString);

End If;

End Sub Main;

After you have executed this example the console window shows the t-value of the Student's distribution:

Module execution started

t-value: 3.0021615717910612

Module execution finished