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TNONCT |
Category | Mathematical |
Syntax | |
Arguments | |
Details | |
Example |
Syntax |
TNONCT(x,df,prob) |
Details |
The TNONCT function returns the nonnegative noncentrality parameter from a noncentral t distribution whose parameters are x, df, and nc. A Newton-type algorithm is used to find a root nc of the equation
where
If the algorithm fails to converge to a fixed point, a missing value is returned.
Example |
data work; x=2; df=4; do nc=1 to 3 by .5; prob=probt(x,df,nc); ncc=tnonct(x,df,prob); output; end; run; proc print; run;
Computations of the Noncentrality Parameter from the t Distribution
OBS x df nc prob ncc 1 2 4 1.0 0.76457 1.0 2 2 4 1.5 0.61893 1.5 3 2 4 2.0 0.45567 2.0 4 2 4 2.5 0.30115 2.5 5 2 4 3.0 0.17702 3.0 |
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