Parabolic SAR (Stop And Reverse)

Parabolic SAR (Stop And Reverse) la chi bao xu huong do J. Welles Wilder gioi thieu nam 1978, the hien bang cac cham phia tren hoac duoi gia. Cac cham dong vai tro stop-loss dong bam theo xu huong (he so gia toc AF bat dau tu 0,02, tang 0,02 moi lan va toi da 0,20); khi gia cat qua mot cham, vi the dung lai va dao chieu. No hieu qua trong thi truong co xu huong nhung tao nhieu tin hieu sai khi gia di ngang.