/*-----------------------------------------------------------------
            S A S   S A M P L E   L I B R A R Y                   
                                                                  
      NAME: SEQDX13                                               
     TITLE: Documentation Example 13 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 13                            
      MISC:                                                       
-----------------------------------------------------------------*/

ods graphics on;
proc seqdesign altref=0.15 errspend
               ;
   NonbindingDesign: design nstages=4
                     method=obf
                     alt=upper
                     stop=both(betaboundary=nonbinding)
                     alpha=0.025 beta=0.10
                     ;
   samplesize model=twosamplefreq(nullprop=0.6 test=prop);
run;