PP = (HIGHprev + LOWprev + CLOSEprev) / 3 R1 = PP + 0.382 * (HIGHprev - LOWprev) S1 = PP - 0.382 * (HIGHprev - LOWprev) R2 = PP + 0.618 * (HIGHprev - LOWprev) S2 = PP - 0.618 * (HIGHprev - LOWprev) R3 = PP + (HIGHprev - LOWprev) S3 = PP - (HIGHprev - LOWprev)