1/6/2022

Free R&b Midi Melodies For Fl Studio 12

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From Proteopedia

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Free R (also called Rfree) 'is generally considered the most useful global measure of model-to-data agreement'[1]. It is a statistical quantity introduced in 1992 by Axel T. Brünger[2] to assess the quality of a model from X-ray crystallographic data. It is calculated in the same manner as the R value, but from a subset of the data set aside for the calculation of free R, and not used in the refinement of the model. It is a more reliable tool for assessing the model than the R value because it is not self-referential -- that is, as an estimation of errors, free R is free of any bias that may have been introduced during refinement. Free R is an example of the application of the more general method of cross validation.

Good Values for Free R

As a rule of thumb, for models with resolution of 2.0 Å or better (Å values <2.0), free R should not exceed (resolution/10) by more than 0.05; that is, if the resolution is 2.0 Å, free R should not significantly exceed 0.25. For resolutions around 3.0 Å, the free R should not exceed (resolution/10). Free R values exceeding the worst 25% for the resolution of the model (see table below) raise doubts about the quality of the model.

Free R is positively correlated with resolution[1]:

Resolution, Å Median Free R[1] Median Free R
- (Resolution/10)
Free R
Best 25%
Free R
Worst 25%
1.0 0.15 0.05 <0.14 >0.17
1.5 0.21 0.06 <0.19 >0.23
1.8 0.23 0.05 <0.21 >0.245
2.0 0.24 0.04 <0.22 >0.26
2.2 0.25 0.03 <0.23 >0.265
2.5 0.26 0.01 <0.245 >0.28
3.0 0.28- 0.02 <0.26 >0.30
3.5 0.30- 0.05 <0.275 >0.33
~4.0 0.31- 0.09 <0.28 >0.35
  • Data in the above table for resolutions <= 3.5 Å are approximated from Figure 3C in [1], based on X-ray entries deposited in the PDB since 1990.
  • Data for resolution ~4.0 Å are based on 199 X-ray entries, for which free R values are given, with resolutions of 3.9-4.1 Å (Feb 2013).
  • The median resolution for X-ray entries in the PDB is 2.07 Å (Feb 2013).

Bad Values for Free R

Free R&b Midi Melodies For Fl Studio 12

In October, 2011, there are 182 X-ray crystallographic entries in the PDB with free R values of >= 0.37. 45 of these have a resolution <= 3.0 Å, and 5 have a resolution of <= 2.0 Å. It seems likely that there are serious errors in most of these 45 models.

In one amazing case, 1zff, the resolution is given as 0.94 Å, the R value as 0.428, and the free R as 0.444.

No Value for Free R

In October, 2011, there are 5,908 X-ray crystallographic entries in the PDB for which no free R value is given. These represent 8.8% of all 66,847 X-ray entries. Most of these were deposited before the free R methodology was described by Brünger in 1992[2].

Deposition Date X-ray entries No Free R
Through 1990 666 666 (100%)
1991-1995 3,209 2,852 (89%)
1996-2000 8,832 1,858 (21%)
2001-2005 18,522 342 (1.8%)
2006-
Oct 2011
35,618 190 (0.5%)

See Also

Content Donors

The initial contents of this page were adapted from the Glossary of ProteinExplorer.Org, with the permission of the principal author, Eric Martz. The Free R entry there was written primarily by Diana Ditmore.

Literature Cited

  1. 1.01.11.21.3 Read RJ, Adams PD, Arendall WB 3rd, Brunger AT, Emsley P, Joosten RP, Kleywegt GJ, Krissinel EB, Lutteke T, Otwinowski Z, Perrakis A, Richardson JS, Sheffler WH, Smith JL, Tickle IJ, Vriend G, Zwart PH. A new generation of crystallographic validation tools for the protein data bank. Structure. 2011 Oct 12;19(10):1395-412. PMID:22000512 doi:10.1016/j.str.2011.08.006
  2. 2.02.1 Brunger AT. Free R value: a novel statistical quantity for assessing the accuracy of crystal structures. Nature. 1992 Jan 30;355(6359):472-5. PMID:18481394

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Proteopedia Page Contributors and Editors (what is this?)

Eric Martz, Eran Hodis

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