research papers
The formulae for the diffraction-component precision index introduced by Cruickshank [(1999), Acta Cryst. D55, 583-601] are simplified using two approximations. A rearranged formula for the precision index is presented which can readily be calculated from experimental data. It is shown that the precision varies as (resolution)5/2 if R and completeness are maintained. It varies as (completeness of intensity measurement)-5/6 and its dependence on the inclusion of solvent atoms is discussed.
Keywords: diffraction-component precision index.
Supporting information
Portable Document Format (PDF) file https://doi.org/10.1107/S0907444902003931/li0426sup1.pdf |