Macromolecular dictionary (mmCIF) version 2.0.09

_refine.correlation_coeff_Fo_to_Fc_free

Definition:

   The correlation coefficient between the observed and
   calculated structure factors for reflections not included
   in the refinement (free reflections).

    The correlation coefficient is scale-independent and gives
    an idea of the quality of the refined model.

                sum~i~(Fo~i~ Fc~i~ - <Fo><Fc>)
  R~corr~ = ------------------------------------------------------------
            SQRT{sum~i~(Fo~i~)^2^-<Fo>^2^} SQRT{sum~i~(Fc~i~)^2^-<Fc>^2^}

    Fo  = observed structure factors
    Fc  = calculated structure factors
    <>    denotes average value

    summation is over reflections not included
    in the refinement (free reflections)

Type: float

Mandatory item: no

Category: refine