Data Item _refine_analyze.RG_free


Item name
Category name
Attribute name
Required in PDB entries
Used in currrent PDB entries

Item Description

The Hamilton generalized R factor for all reflections that satisfy the resolution limits established by _refine_analyze.RG_d_res_high and _refine_analyze.RG_d_res_low for the free R set of reflections that were excluded from the refinement. sum_i sum_j w_{i,j}(|Fobs|_i - G|Fcalc|_i)(|Fobs|_j - G|Fcalc|_j) RG = Sqrt( ----------------------------------------------------------------- ) sum_i sum_j w_{i,j} |Fobs|_i |Fobs|_j where |Fobs| = the observed structure-factor amplitudes |Fcalc| = the calculated structure-factor amplitudes G = the scale factor which puts |Fcalc| on the same scale as |Fobs| w_{i,j} = the weight for the combination of the reflections i and j. sum_i and sum_j are taken over the specified reflections When the covariance of the amplitudes of reflection i and reflection j is zero (i.e. the reflections are independent) w{i,i} can be redefined as w_i and the nested sums collapsed into one sum. sum_i w_i(|Fobs|_i - G|Fcalc|_i)2 RG = Sqrt( ----------------------------------- ) sum_i w_i |Fobs|_i2 Ref: Hamilton, W. C. (1965). Acta Cryst. 18, 502-510.

Data Type

Data type code
Data type detail
float item types are the subset of numbers that are the floating numbers.
Primitive data type code
Regular expression

Allowed Boundary Conditions

Minimum Value Maximum Value