Bragg R factor

Definition

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

[math]R_B = {{\sum | I_{obs} - I_{calc} | } \over {\sum |I_{obs} |}}[/math].

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