/*-----------------------------------------------------------------
            S A S   S A M P L E   L I B R A R Y                   
                                                                  
      NAME: SEQDX12                                               
     TITLE: Documentation Example 12 for PROC SEQDESIGN           
   PRODUCT: STAT                                                  
    SYSTEM: ALL                                                   
      KEYS: group sequential design                               
     PROCS: SEQDESIGN                                             
      DATA:                                                       
                                                                  
   SUPPORT: Yang Yuan             UPDATE: Aug 21, 2007            
       REF: PROC SEQDESIGN, EXAMPLE 12                            
      MISC:                                                       
-----------------------------------------------------------------*/

ods graphics on;
proc seqdesign altref=2
               pss(cref=0 0.5 1)
               stopprob(cref=0 1)
               errspend
               plots=(asn power errspend)
               ;
TwoSidedAsymmetric: design nstages=4
                    method=errfuncgamma(gamma=1)
                    method(beta)=errfuncgamma(gamma=-2)
                    method(upperalpha)=errfuncgamma(gamma=-5)
                    alt=twosided
                    stop=both
                    beta=0.1
                    ;
run;