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The following is symmetric, and suitable for comparing two data sets, or two model amplitudes:

The following is symmetric, and suitable for comparing two data sets, or two model amplitudes:

<math>

<math>

− R=\frac{\sum_{hkl}\vert F_{hkl~~}^{~~i}-F_{hkl~~}^{~~j}\vert}{\sum_{hkl} ~~1/2 (~~F_{hkl~~}^{~~i}+F_{hkl~~}^{~~j}~~)~~}

+ R=\frac{\sum_{hkl}\vert F_{hkl,i}-F_{hkl,j}\vert}{0.5\sum_{hkl} F_{hkl,i}+F_{hkl,j}}

</math>

</math>

−for amplitudes, and analogously for intensities~~:~~

+for amplitudes, and analogously for intensities. This R value is called R<sub>scale</sub>, as far as I know.

=== Model quality indicators ===

=== Model quality indicators ===

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