Definitions for r-factor

This page provides all possible meanings and translations of the word r-factor

Freebase

  1. R-factor

    In crystallography, the R-factor is a measure of the agreement between the crystallographic model and the experimental X-ray diffraction data. In other words, it is a measure of how well the refined structure predicts the observed data. It is defined by the following equation: where F is the so-called structure factor and the sum extends over all the reflections measured and their calculated counterparts respectively. The structure factor F is closely related to the intensity of the reflection it describes: For large molecules, R-factor usually ranges between 0.6 and 0.2. Small molecules usually form more ordered crystals than large molecules, it is possible to attain lower R-factors. In the Cambridge Structural Database more than 95% of the 500,000+ crystals have an R-factor lower than 0.15 and 9.5% have an R-factor lower than 0.03. Crystallographers also use the Free R-Factor to describe the quality of a model. The quantities and are similarly used to describe the internal agreement of measurements in a crystallographic data set.

Translation

Find a translation for the r-factor definition in other languages:

Select another language:

Discuss these r-factor definitions with the community:


Citation

Use the citation below to add this definition to your bibliography:

Style:MLAChicagoAPA

"r-factor." Definitions.net. STANDS4 LLC, 2014. Web. 28 Jul 2014. <http://www.definitions.net/definition/r-factor>.

Are we missing a good definition for r-factor?


The Web's Largest Resource for

Definitions & Translations


A Member Of The STANDS4 Network


Nearby & related entries:

Alternative searches for r-factor: