kc_lower

Parameters

Keltner Channels Lower Band - kc_lower(source, length, mult, matype="ema", atr_length=None, atr_matype="wilder", bandstyle="atr")

Volatility-based lower band using MA and range-based volatility measure.

• source (field): Price field for middle line calculation (typically close)
• Valid inputs: close, open, high, low, or any indicator output
• length (int): Period for middle line MA calculation
• Common values: 20, 10, 50
• mult (float): Multiplier for band width
• Common values: 2.0, 1.5, 2.5
• matype (str, optional): MA type for middle line
• Valid options: ["ema", "sma", "wma", "wilder"]
• Default: "ema"
• atr_length (int, optional): Period for volatility calculation (ATR/range)
• Default: None (uses same as length)
• Allows independent control of band smoothing
• atr_matype (str, optional): MA type for ATR smoothing
• Valid options: ["wilder", "sma", "ema"]
• Default: "wilder" (traditional ATR)
• bandstyle (str, optional): Volatility measurement method
• "atr": Use ATR (average true range) - TradingView default
• "truerange": Use raw true range (no averaging)
• "range": Use Wilder MA of (high - low)

Formula

middle = MA(source, length, matype)

if bandstyle == "atr":
    range_value = ATR(atr_length or length, matype=atr_matype)
elif bandstyle == "truerange":
    range_value = TrueRange (no averaging)
elif bandstyle == "range":
    range_value = WilderMA(high - low, atr_length or length)

lower = middle - (mult * range_value)

Examples

kc_low = kc_lower(close, 20, 2.0);  # Standard KC lower
kc_low = kc_lower(close, 20, 2.0, matype="sma");  # SMA-based middle
kc_low = kc_lower(close, 20, 2.0, atr_length=14);  # Different ATR period
kc_low = kc_lower(close, 20, 2.0, bandstyle="range");  # Wilder MA of range
close < kc_low;  # Price below lower band (oversold)

Returns

Float value representing the lower band