/*
This file produces a confidence interval for the noncentrality
parameter of a noncentral t distribution.
The required input rows must contain the t value, df, 
and desired confidence level. 
An example input row is given in the line below "cards;".
The last two parameters in the output are the lower limit (ncplow)
and upper limit (ncpupp) of the noncentrality parameter. 
*/
SYNTAX:
data x;
 input  t df conf;
  prlow = 1-(1-conf)/2;
  prupp = (1-conf)/2;
   ncplow = tnonct (t,df,prlow);
   ncpupp = tnonct (t,df,prupp);
    cards;
2.65	11	.950
;
proc print;

run;
/*
Output looks like this:
     Obs      t     df    conf    prlow    prupp     ncplow     ncpupp
      1     2.65    11    0.95    0.975    0.025    0.36012    4.84933
*/