def detect_autocorrelation(time)
      analysis[time.to_sym].detect_autocorrelation(
        self.case.autocorrelation.max_lags.to_i,
        self.case.autocorrelation.alpha_level.abs)
    end
def detect_autocorrelation(time)
      analysis[time.to_sym].detect_autocorrelation(
        self.case.autocorrelation.max_lags.to_i,
        self.case.autocorrelation.alpha_level.abs)
    end
Returns the q value for the Ljung-Box statistic of this +time+'s
 analysis.detect_autocorrelation method.