mirror of
https://github.com/mihakralj/QuanTAlib.git
synced 2026-08-16 01:28:05 +00:00
Miha Kralj
24e86d762a
- Updated BBWN, BBWP, CCV, CV, CVI, EWMA, GKV, HLV, HV, Jvolty, JVOLTYN, MASSI, NATR, RSV, RV, RVI, TR, UI, VOV, VR, YZV indicators with documentation links. - Added documentation links for Aberration, Acceleration Bands, Andrews' Pitchfork, Adaptive Price Zone, ATR Bands, Bollinger Bands, Center of Gravity, Donchian Channels, Decay Min-Max Channel, Detrended Synthetic Price, EACP, EBSW, HOMOD, Jurik Volatility Bands, Keltner Channel, MA Envelope, Min-Max Channel, Price Channel, Regression Channels, Standard Deviation Channel, Stoller Average Range Channel, Super Trend Bands, Ultimate Bands, Ultimate Channel, VWAP Bands, and VWAP with Standard Deviation Bands.
65 lines
2.3 KiB
Plaintext
65 lines
2.3 KiB
Plaintext
// The MIT License (MIT)
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// © mihakralj
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//@version=6
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indicator("Choppiness Index", "CHOP", overlay=false)
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//@function Calculates Choppiness Index to measure market trendiness
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//@param length Lookback period for calculation
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//@returns CHOP value between 0 and 100 (lower=trending, higher=choppy)
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//@references E.W. Dreiss, Australian commodity trader
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//@optimized O(n) with circular buffers for TR sum and high/low tracking
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chop(simple int length) =>
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if length <= 1
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runtime.error("Length must be > 1")
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var float sum_tr = 0.0
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var int head = 0
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var int filled = 0
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var array<float> atr_buf = array.new_float(length, na)
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var array<float> high_buf = array.new_float(length, na)
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var array<float> low_buf = array.new_float(length, na)
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float prevClose = nz(close[1], close)
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float tr = math.max(high - low, math.max(math.abs(high - prevClose), math.abs(low - prevClose)))
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float out = array.get(atr_buf, head)
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if not na(out)
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sum_tr -= out
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else
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filled += 1
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array.set(atr_buf, head, tr)
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array.set(high_buf, head, high)
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array.set(low_buf, head, low)
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sum_tr += tr
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int win = math.min(filled, length)
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float hhv = -1e100
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float llv = 1e100
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for k = 0 to win - 1
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int idx = (head - k + length) % length
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float h = array.get(high_buf, idx)
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float l = array.get(low_buf, idx)
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if not na(h)
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hhv := math.max(hhv, h)
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if not na(l)
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llv := math.min(llv, l)
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head := (head + 1) % length
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float price_range = hhv - llv
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float chop_value = na
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if win >= 2 and price_range > 0
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float log_ratio = math.log10(sum_tr / price_range)
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float log_len = math.log10(win)
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chop_value := 100.0 * log_ratio / log_len
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chop_value := math.max(0.0, math.min(100.0, chop_value))
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chop_value
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// ---------- Main loop ----------
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// Inputs
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i_length = input.int(14, "Length", minval=2)
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// Calculation
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chop_value = chop(i_length)
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// Plot
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plot(chop_value, "CHOP", color=color.yellow, linewidth=2)
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hline(61.8, "High Threshold", color=color.new(color.red, 50), linestyle=hline.style_dashed)
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hline(38.2, "Low Threshold", color=color.new(color.green, 50), linestyle=hline.style_dashed)
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hline(50, "Midline", color=color.new(color.gray, 70), linestyle=hline.style_dotted)
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