Directional movement as a filter plus trigger

A three-job stack

TradersWeek editorial: directional movement is easier to handle when it is treated as a three-job stack rather than a single buy-or-sell line. Use the average directional index to decide whether a trend model is even in play. Use the plus directional line and the minus directional line only to vote for side. Delay action until an extreme-point price trigger confirms follow-through. Combining those jobs inside one indicator family is how every line cross is kept from becoming an order.

Directional movement can be scored from 0 to 100. A trend-following method can restrict attention to high readings, while a method built for choppy markets can restrict attention to low readings.

The same directional-movement family is commonly used as a screen for whether a tradable trend is present, rather than as a standalone buy-or-sell switch.

The average directional index as a trend-presence filter

The average directional index is the spread between the two directional lines. It rises when that spread widens and is then read as a reason to follow the higher line with a trend-following method.

A falling average directional index, produced as the spread between the directional lines narrows, is read as the dominant side losing strength while the weaker side gains.

A trend-presence filter uses a low or falling average directional index to mark a lull, and a turn-up through the lower directional line to mark a market leaving that lull.

One complementary rule looks for the average directional index to turn up from a low reading, preferably below 20, and then cross the lower directional line as evidence that a forceful trend is forming.

Another stated alert, the four-step advance, looks for the average directional index to remain below both directional lines and then rise four steps from that low. That sequence is interpreted as a market leaving a lull.

Directional lines vote for side

A standard directional-line rule treats a rise of the plus directional line through the minus directional line as a long-side signal and the opposite cross as a short-side signal.

TradersWeek editorial: those crosses are side votes. They are not, by themselves, implementation instructions.

The extreme-point rule as the later trigger

The extreme-point rule notes the high of the day the plus directional line crosses above the minus directional line, or the low of the day the plus directional line crosses below it, and uses that price as the later trigger so fewer crosses become trades.

Confirmation versus entry

In a worked composite-index example, an average directional index cross of the lower directional line was treated as confirmation of an earlier directional-line crossover, with the option to wait for a later pullback or bounce instead of acting on the confirmation print.

That is confirmation versus entry: the average directional index cross checks an earlier directional-line vote, while actual entry can be postponed to a later pullback or bounce.

The same directional-system readings can first scan indexes or sector products for a low average directional index or a fresh directional signal, then be followed by closer inspection of constituents or by unrelated price-structure setups.