?  P&R Example 17.1
 
options crt ;
freq q ; 
smpl 60:1 95:4 ;
read(file='\tsp\prhb\datadisk\ex171.xls') gvuq ;
inven = gvuq ;

bjident (nlagp=24,nlag=24) inven ;
bjest (constant,nar=1,noplot) inven ;