選股出來的數據與劃面的數據不符的問題

input:AA(150),BB(0);

variable:RRI(0),RRR(0);

value1=GetSymbolField("tse.tw","收盤價");

value2=GetSymbolField("otc.tw","收盤價");

if value1 <> 0 then RRI = AA*close/value1;

if value2 <> 0 then RRR = BB*close/value2;

//if RRI >= 0 then plot1(RRI,"大盤比");

value3 = summation(RRI,20);

value4 = value3/20;

value5 = (RRI - value4);

這是本人劃面與選股的程式，在value4出來的數據與本人在劃面上的走勢數據不相符，問題在那裡

謝謝你

condition1 = value5 >= 0 and volume > 500;

if condition1 then ret = 1;