Bragg R factor

From Online Dictionary of Crystallography

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The R factor measuring the agreement between the reflection intensities calculated from a crystallographic model and those measured experimentally.

R_B = {{\sum | I_{obs} - I_{calc} | } \over {\sum |I_{obs} |}}.

In the Rietveld method RB is useful because it depends on the fit of the structural parameters and not on the profile parameters.