Each R-free flag corresponds a particular HKL index. Redundancy refers to the number of times a reflection corresponding to a given HKL index is observed. The final structure factor of a given HKL can be thought of as an average of these redundant observations.
Related to your question, someone once mentioned that for each particular space group, there should be a preferred R-free assignment. As far as I know, nothing tangible ever came of that idea. James On Oct 14, 2011, at 5:34 PM, D Bonsor wrote: > I may be missing something or someone could point out that I am wrong and why > as I am curious, but with a highly redundant dataset the difference between > refining the final model against the full dataset would be small based upon > the random selection of reflections for Rfree?
