# Difference between revisions of "Bragg R factor"

## Definition

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.