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R-factors

1,031 bytes added, 17:52, 17 February 2008
Model quality
* typical values: ...
=== Model quality ===
 
 
==== Relation between R and R<sub>free</sub> as a function of resolution ====
 
References:
* Tickle IJ, Laskowski RA and Moss DS. Rfree and the Rfree Ratio. I. Derivation of Expected Values of Cross-Validation Residuals Used in Macromolecular Least-Squares Refinement. Acta Cryst. (1998). D54, 547-557 [http://dx.doi.org/10.1107/S0907444997013875]
 
* Tickle IJ, Laskowski RA and Moss DS. Rfree and the Rfree ratio. II. Calculation of the expected values and variances of cross-validation statistics in macromolecular least-squares refinement. Acta Cryst. (2000). D56, 442-450 [http://dx.doi.org/10.1107/S0907444999016868]
 
* GJ Kleywegt and TA Jones (2002). Homo Crystallographicus - Quo vadis? Structure 10, 465-472. (reprint from http://xray.bmc.uu.se/cgi-bin/gerard/reprint_mailer.pl?pref=65)
- plot: http://xray.bmc.uu.se/gerard/supmat/rfree2000/rfminusr_vs_resolution.gif
 
- many more plots: http://xray.bmc.uu.se/gerard/supmat/rfree2000
 
- harry plotter (java): http://xray.bmc.uu.se/gerard/supmat/rfree2000/plotter.html
== what kinds of problems exist with these indicators? ==
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