ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
If intensities of reflexion have one or other of the ideal distributions [Wilson (1949). Acta Cryst. 2, 318- 320], the sum of n such intensities has a gamma (γ) distribution with parameter n (acentric) or n/2 (centric), and the ratio of two such sums has a beta (β) distribution. These distributions are applied to (i) intensities normalized to the ideal average Σ; (ii) intensities normalized to the local average (I); (iii) ratios used for scaling. Bias in scaling is discussed, and certain results are obtained for non-ideal distributions. Expressions are obtained for the variance of the traditional reliability index R for both ideal distributions; these have applications in certain methods of structure determination [Rabinovich & Shakked (1984). Acta Cryst. A40, 195-200].
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108767386099166
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