pub fn ratio_close_series(
a: &[Candle],
b: &[Candle],
) -> Result<Vec<(DateTime<Utc>, Decimal)>, RatioCandleError>Expand description
Return only the closes of a synthetic ratio series — convenience for
callers that want a (timestamp, ratio_close) series for statistical
analysis (Hurst, Variance Ratio, autocorrelation).
Equivalent to synthesize_ratio_candles(a, b) then mapping to close values,
but slightly cheaper (no high/low computation, no min volume).