    267

)  )   

7,			
	^	^^	
^			
^			
		2	aiM


7,			
		1^^'	
^			
,			
	1	0	,

. 10.2.    

 ,       (-
       )  ,
  .  ,   ,  . ^ < 0, ..  -
         ( ,
       ,   ,    -
   ).

     ,    
 = ^2 _   ,    -
 ,  ,-    ,       
  .

 SML         :

/,='-/+(	'-^.,	(10.7)
  ,^  :		
,	,	(10.8)
	^'	

    (beta coefficient} (  ) 
 i       .
 (10.7)       SML,   
. 10.2(6).            ,  
 .  ,   (10.7),  (  ),  -
  (10.6) - [(?- )/^].

        ,   -
          ,
         .   -
      :