## How does the T.INV function (DAX) work?

The T.INV function (DAX) returns the left-tailed inverse of the Student’s t-distribution.

## T.INV Formula Syntax

T.INV(
Probability,Deg_freedom
)

## How do you use the T.INV function?

This function will calculate the left-tailed student’s t-distribution. The student’s t-distribution is a continuous probability distribution that is frequently used in testing hypotheses on small sample data sets.

## Related Support Forum Posts

Dax Calculation question
Dax not working
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## Considerations when using the T.INV function

• If either argument is nonnumeric, T.INV returns the #VALUE! error value.
• If probability <= 0 or if probability > 1, T.INV returns the #NUM! error value.
• If deg_freedom is not an integer, it is truncated.
• If deg_freedom < 1, T.INV returns the #NUM! error value.

## Formula examples using the T.INV function

EVALUATE { T.INV(0.75, 2) }

=T.INV(0.75,2)

=T.INV( 0.25, 10 )

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