加權一年來漲跌幅VS股票漲跌幅做高低判斷,為什麼加權指數一年的計算會有落差?

input: aa(199,"期數");

value1= GetSymbolField("TSE.TW","收盤價","D");

value2= value1[0]/ value1[aa]- 1;

outputfield1(value2*100,"加權");

value3= close[0]/ close[aa]- 1;

outputfield2(value3*100,"漲跌");

value4= GetField("成交金額","D");

value5=GetField("月營收年增率","M");

outputfield3(value5,1,"月營收年增率");

value6=GetField("股價淨值比","D");

outputfield4(value6,1,"股價淨值比");

if value2< value3 and value4> 0.5 then

begin

value11=1;

value12=0;

ret=1;

outputfield11(value11,">加權");

outputfield12(value12,"<加權");

end;

if value2> value3 and value4> 0.5 then

begin

value11=0;

value12=1;

ret=1;

outputfield11(value11,">加權");

outputfield12(value12,"<加權");

end;