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https://github.com/mihakralj/QuanTAlib.git
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Miha Kralj
48 lines
2.2 KiB
Plaintext
48 lines
2.2 KiB
Plaintext
// Licensed under the Apache License, Version 2.0
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// © mihakralj
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//@version=6
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indicator("Aberration (ABERR)", "ABERR", overlay=true)
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//@function Calculates Aberration bands measuring deviation from a central moving average
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//@param source Series to calculate aberration from
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//@param ma_line Pre-calculated moving average line
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//@param period Lookback period for deviation calculation
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//@param multiplier Multiplier for deviation bands
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//@returns [upper_band, lower_band, deviation] Aberration band values and deviation
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//@optimized Uses simple deviation averaging with O(n) complexity
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aberr(series float source, series float ma_line, simple int period, simple float multiplier) =>
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if period <= 0 or multiplier <= 0.0
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runtime.error("Period and multiplier must be greater than 0")
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float deviation = math.abs(nz(source) - nz(ma_line))
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float avg_deviation = ta.sma(deviation, period)
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float upper_band = ma_line + multiplier * avg_deviation
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float lower_band = ma_line - multiplier * avg_deviation
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[upper_band, lower_band, avg_deviation]
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// ---------- Main loop ----------
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// Inputs
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i_source = input.source(close, "Source")
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i_period = input.int(20, "Period", minval=1)
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i_ma_type = input.string("SMA", "Moving Average Type", options=["SMA", "EMA", "WMA", "RMA", "HMA"])
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i_multiplier = input.float(2.0, "Deviation Multiplier", minval=0.1, step=0.1)
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i_show_ma = input.bool(true, "Show Moving Average Line")
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// Calculate the moving average based on selected type
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ma_line = switch i_ma_type
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"SMA" => ta.sma(i_source, i_period)
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"EMA" => ta.ema(i_source, i_period)
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"WMA" => ta.wma(i_source, i_period)
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"RMA" => ta.rma(i_source, i_period)
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"HMA" => ta.wma(2 * ta.wma(i_source, i_period / 2) - ta.wma(i_source, i_period), math.round(math.sqrt(i_period)))
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=> ta.sma(i_source, i_period)
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// Calculation
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[upper_band, lower_band, deviation] = aberr(i_source, ma_line, i_period, i_multiplier)
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// Plots
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p_upper = plot(upper_band, "Upper Band", color=color.yellow, linewidth=2)
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p_lower = plot(lower_band, "Lower Band", color=color.yellow, linewidth=2)
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plot(i_show_ma ? ma_line : na, "MA", color=color.yellow, linewidth=2)
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fill(p_upper, p_lower, color=color.new(color.blue, 90), title="Band Fill")
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