NAG Library Manual, Mark 30.2
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NAG CL Interface Introduction
Example description

nag_stat_inv_cdf_beta_vector (g01tec) Example Program Results

        tail         p          a         b       beta   ivalid
 ---------------------------------------------------------------
   Nag_LowerTail   0.500      1.00      2.00     0.293      0
   Nag_LowerTail   0.990      1.50      1.50     0.967      0
   Nag_LowerTail   0.250     20.00     10.00     0.611      0