# Tinv

Tinv-func

## Definition:

computes the deviate associated with the lower tail probability of Student's t-distribution with real degrees of freedom.

The deviate, associated with the lower tail probability,, of the Student's t-distribution with degrees of freedom is defined as the solution to

,

## Parameters:

- p (input, double)
- The probability.
- df (input, double)
- The degrees of freedom, , of the Student's t-distribution.()
- tp (output, double)
- The value of the Student's variate.