Double Tops and Double Bottoms

Double Tops and Double Bottoms
In February 1998 edition of Technical Analysis of Stock and Commodities Magazine, Thomas Bulkowski discusses the use of Double Bottoms as a means of finding profitable trades.
In MetaStock for Windows, you can find and Double Tops and Double Bottoms by these formulas. There is a caveat however. In the article, Mr. Bulkowski use high frequencies in finding low double bottoms. These formulas use only the close value, so some of the issues that are not lower prices will produce signals in MetaStock. Overall, however, these formulas produce most of the major signals that are discussed.
Double Tops
PC: = Sig (C, 10,%) <Ref(Zig(C,10,%),-1) Ref(Zig(C,10,%),-1)> AND Ref (Zig (C, 10, %), - 2);
Tr: = Sig (C, 10%)> Ref (Zig (C, 10 ,%),- 1) AND Ref (Zig (C, 10 ,%),- 1) <Ref (Zig (C, 10, %), - 2);
PK1: PeakBars = (1 C, 10);
PK2: = PeakBars (2 C, 10);
(ValueWhen (1, PK, Ref (C, -1)) / ValueWhen (2, PK, Ref (C, -1))> And ValueWhen 0,96 (1, PK, Ref (C , -1)) / ValueWhen (2, PK, Ref (C, -1)) <1.04) and PK2-PK1> = 10 AND Cross (ValueWhen (1, TR, Ref (C, -1)), c)

Double Bottoms
PC: = Sig (C, 10,%) <Ref(Zig(C,10,%),-1) Ref(Zig(C,10,%),-1)> AND Ref (Zig (C, 10, %), - 2);
Tr: = Sig (C, 10%)> Ref (Zig (C, 10 ,%),- 1) AND Ref (Zig (C, 10 ,%),- 1) <Ref (Zig (C, 10, %), - 2);
TR1: TroughBars = (1 C, 10);
TR2: = TroughBars (2 C, 10);
(ValueWhen (1, TR, Ref (C, -1)) / ValueWhen (2, TR, Ref (C, -1))> And ValueWhen 0,96 (1, TR, Ref (C, -1)) / ValueWhen (2, TR, Ref (C, -1)) <1.04) and TR2-TR1> = 10 AND Cross (C, ValueWhen (1, PK, Ref (C, -1)))