T.INV DAX Function (Statistical)

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

Syntax

T.INV ( <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 left-tailed inverse of the Student’s t-distribution.

Remarks

The Probability argument must be between 0 and 1.
The Deg_freedom argument 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: Jul 23, 2021   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

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

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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.

Iterator

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.

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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