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TINV

TINV

Returns a quantile from the t distribution

Category: Quantile

Syntax
Arguments
Details
Examples

Syntax

TINV(p,df<,nc>)

Arguments

is a numeric probability.

Range:

[le]

is a numeric degrees of freedom parameter.

Range:

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. [cautend]

SAS Statements Results

x=tinv(.95,2);

2.9199855804

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

1.033833625

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