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close.ewm(span=slow_period, adjust=False).mean() macd_line = fast_ema - slow_ema signal_line = macd_line.ewm(span=signal_period, adjust=False).mean() histogram = macd_line - signal_line return macd_line # Calculate OBV def obv(close, volume): obv = np.where(close > close.shift(), volume,