# T.INV.2TDAX Function (Statistical)

Returns the two-tailed inverse of the Student’s t-distribution.

## Syntax

T.INV.2T ( <Probability>, <Deg_freedom> )
Parameter Attributes Description
Probability

The probability associated with the Student’s t-distribution.

Deg_freedom

The number of degrees of freedom with which to characterize the distribution.

## Return values

Scalar A single decimal value.

The two-tailed inverse of the Student’s t-distribution.

## Remarks

The two arguments cannot be negative.

» 4 related functions

## Examples

```--  T.INV    returns the left-tailed inverse of the Student's t-distribution
--  T.INV.2T returns the two-tailed inverse of the Student's t-distribution
--
--  https://en.wikipedia.org/wiki/Student%27s_t-distribution
DEFINE
VAR DegFreedom      = 4.6
VAR Percs           = GENERATESERIES ( 0.05, 0.99, 0.05 )
EVALUATE
SELECTCOLUMNS (
Percs,
"Probability %", [Value],
"T.INV",
FORMAT (
T.INV ( [Value], DegFreedom ),
"#,0.00000"
),
"T.INV.2T",
FORMAT (
T.INV.2T ( [Value], DegFreedom ),
"#,0.00000"
)
)
```
Probability % T.INV T.INV.2T
5.0000000000% -2.01505 2.57058
10.0000000000% -1.47588 2.01505
15.0000000000% -1.15577 1.69936
20.0000000000% -0.91954 1.47588
25.0000000000% -0.72669 1.30095
30.0000000000% -0.55943 1.15577
35.0000000000% -0.40823 1.03055
40.0000000000% -0.26718 0.91954
45.0000000000% -0.13218 0.81909
50.0000000000% 0.00000 0.72669
55.0000000000% 0.13218 0.64057
60.0000000000% 0.26718 0.55943
65.0000000000% 0.40823 0.48225
70.0000000000% 0.55943 0.40823
75.0000000000% 0.72669 0.33672
80.0000000000% 0.91954 0.26718
85.0000000000% 1.15577 0.19914
90.0000000000% 1.47588 0.13218
95.0000000000% 2.01505 0.06591

## Related functions

Other related functions are:

Last update: Sep 11, 2024     » Show contributors

Contributors: Alberto Ferrari, Marco Russo

Microsoft documentation: https://docs.microsoft.com/en-us/dax/t-inv-2t-dax

# Context Transition

This function performs a Context Transition if called in a Row Context. Click to read more.

# Row Context

This expression is executed in a Row Context. Click to read more.

# Not recommended

The use of this function is not recommended. See Remarks and Related functions for alternatives.

# Not recommended

The use of this parameter is not recommended.

# Deprecated

This function is deprecated. Jump to the Alternatives section to see the function to use.

# Volatile

A volatile function may return a different result every time you call it, even if you provide the same arguments. Click to read more.

# Deprecated

This parameter is deprecated and its use is not recommended.

# DirectQuery compatibility

Limitations are placed on DAX expressions allowed in measures and calculated columns.
The state below shows the DirectQuery compatibility of the DAX function.

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