##
T_PDF

The
T_PDF
function computes the probability *
P*
that, in a
Student's t distribution with *
Df*
degrees of freedom, a random variable *
X*
is less than or equal to a user-specified cutoff value *
V*
.

This routine is written in the IDL language. Its source code can be found in the file ```
t_pdf.pro
```

in the ```
lib
```

subdirectory of the IDL distribution.

###
Calling Sequence

Result = T_PDF(*
V, Df*
)

###
Arguments

####
V

An integer, single-, or double-precision floating-point scalar that specifies the cutoff value.

####
Df

A positive integer, single- or double-precision floating-point scalar that specifies the number of degrees of freedom of the Student's t distribution.

###
Example

Use the following command to compute the probability that a random variable X, from the Student's t distribution with 15 degrees of freedom, is less than or equal to 0.691. The result should be 0.749940.

result = T_PDF(0.691, 15)

PRINT, result

IDL prints:

0.749940