Functions and CALL Routines 
Returns a quantile from the t distribution.

p

is a numeric probability.

df

is a numeric degrees of freedom parameter.

nc

is an optional numeric noncentrality parameter.
The TINV function returns the p^{th} quantile from the Student's t
distribution with degrees of freedom df and a noncentrality parameter nc. The probability that an observation from a t distribution
is less than or equal to the returned quantile is p.
TINV accepts a noninteger degree of freedom parameter df. If the optional parameter
nc is not specified or
is 0, the quantile from the central t distribution is returned.
 CAUTION:
 For large values of nc,
the algorithm can fail. In
that case, a missing value is returned.
Note: TINV is the inverse of the PROBT function.
SAS Statements 
Results 
x=tinv(.95,2);

2.9199855804

x=tinv(.95,2.5,3);

11.033833625

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