Acta Cryst. (1983). A39, 876-881 [ doi:10.1107/S0108767383001762 ]
Abstract: The behaviour of Rogers's ![[eta]](/logos/entities/eta_rmgif.gif)
parameter for enantiomorph-polarity estimation is examined theoretically and experimentally on simulated intensity data for seven well-assorted compounds. An alternative parameter x, based on incoherent scattering from twin components related by a centre of symmetry, is also considered. It is found that both parameters are very well adapted to implementation in a least-squares program and converge well. The parameter can give false and over-precise indications of chirality-polarity for structures which are nearly centrosymmetric, whereas the x parameter does not have this fault and converges more rapidly than .
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