R-factors

From CCP4 wiki
Revision as of 06:35, 9 February 2008 by Kay (talk | contribs) (New page: Historically, R-factors were introduced by ... == Definitions == === Data quality indicators === * R_sym and R_merge: the formula is (someone with LaTex knowledge please don't hesitate!)...)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigationJump to search

Historically, R-factors were introduced by ...

Definitions

Data quality indicators

  • R_sym and R_merge: the formula is (someone with LaTex knowledge please don't hesitate!)
  • Redundancy-independant version of the above: R_meas
  • measuring quality of averaged intensities/amplitudes: R_p.i.m./R_mrgd-F

Model quality indicators

  • R and R_free: the formula is (someone with LaTex knowledge please don't hesitate!)

what do R-factors try to measure, and how to interpret their values?

  • relative deviation of

what kind of problems exist with these indicators?

- (R_sym/R_merge) should not be used, R_meas should be used instead (explain why ?) - R/R_free and NCS: reflections in work and test set are not independant