一个看大盘的小公式(通达信)

老师们教导"炒股必看大盘",我受网上一短教学片启发作了一个看大盘的小公式(沪深300),就当新年小礼物于大家分享,水平有限敬请谅解!
草民抄底
bias1:(C-MA(C,7))/MA(C,7)*100;
BIAS2:(C-MA(C,14))/MA(C,14)*100;
BIAS3:(C-MA(C,28))/MA(C,28)*100;
DRAWTEXT(BIAS1<-6,-8,'注'),COLORGREEN;
DRAWTEXT(BIAS2<-10,-16,'意'),COLORLICYAN;
DRAWTEXT(BIAS3<-16,-20,'底'),COLORRED;
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补充一点:它是用来"做"反弹的,自己要设至赢位!