Choppiness Index (CHOP) on Gold

What it shows

A 0 to 100 line under the candles, with guides at 61.8 and 38.2 and the strip between them shaded. Above the top guide the window is tangled; below the bottom one the candles are stacking in a line. Nothing on it says up or down.

How Pravex works it out

1. Add up the true range of the last 14 candles. True range is the largest of high − low, high − previous close and low − previous close.
2. Find the full span of that window: the highest high − the lowest low.
3. Ratio = sum of the true ranges ÷ full span.
4. CHOP = 100 × log10(ratio) ÷ log10(length). If the candles line up in one straight move, the sum equals the span, the ratio is 1 and CHOP is 0. The more they overlap, the bigger the ratio and the closer CHOP gets to 100.
5. Toy numbers to follow the log step: a true range sum of 28 over a span of 14 gives a ratio of 2, so CHOP = 100 × 0.301 ÷ 1.146 = 26.3.

Settings

Setting	Default	What changing it does
Length	14	How many candles are in the window. A shorter window reacts fast and flips often; a longer one gives a steadier read of the larger swing.
Offset	0	Moves the line that many candles to the right, or to the left if negative. It changes where the line is drawn, not the numbers.

How traders read it

Over 61.8, the last 14 candles have mostly been covering the same ground. Under 38.2, each candle has added new ground in one direction, which is what a trend looks like from the inside.

CHOP works best as a gate for other tools. A moving-average cross on gold carries more weight when CHOP is low, and a fade of the range edges carries more when it is high.

A line that drops from the upper band toward the lower one says the range is giving way to a move. It does not say which way.

When it misleads

CHOP is blind to direction: a steady fall and a steady rise both give a low reading. It also lags, since it describes the past 14 candles, so it often turns low only after the move is well under way. After a sharp trend ends, the same candles keep CHOP low for a while even though price has gone sideways. On gold, a calm stretch of small, overlapping candles pushes the reading up, and the first hours of the week begin from a window that still holds Friday’s candles, as there are no weekend ones.

Questions and answers

Why are the guides at 61.8 and 38.2?

They are Fibonacci ratios that came with the indicator as rough marks. Nothing in the formula makes those values special, so treat them as a starting point, not a boundary.

Is a CHOP reading over 61.8 a cue to trade the range?

The candles in the window overlap a lot, so price has been going sideways rather than in a line. It does not mean a move is about to start.

Does the Choppiness Index show direction?

No. A fast rise and a fast fall both read low. Use it next to something that shows direction.

Why does CHOP climb in calm gold hours?

In those hours gold’s candles are small and sit on top of each other, so their true ranges add up to far more than the window’s high-low span. The ratio grows and CHOP rises, then drops once wider candles start to travel.

Related: Chop Zone, Vortex Indicator, Trend Strength Index, every indicator.