1. sharpeRratio::a
    A pre-calibrated spline function needed to translate the number of upper/lower records in to signa-to-noise ratios.
    json| rda| rds
    function
  2. sharpeRratio::f
    A pre-calibrated spline function needed to translate the number of upper/lower records in to signa-to-noise ratios.
    json| rda| rds
    function