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== Definitions ==

== Definitions ==

=== Data quality indicators ===

=== Data quality indicators ===

−* ~~R_sym ~~and ~~R_merge~~: the formula is (someone with LaTex knowledge please don't hesitate to fill in the formula!)

+* R<sub>sym</sub> and R<sub>merge</sub> : the formula is (someone with LaTex knowledge please don't hesitate to fill in the formula!)

−* Redundancy-independant version of the above: ~~R_meas~~

+* Redundancy-independant version of the above: R<sub>meas</sub>

−* measuring quality of averaged intensities/amplitudes: ~~R_p~~.i.m./~~R_mrgd~~-F

+* measuring quality of averaged intensities/amplitudes: R<sub>p.i.m.</sub> and R<sub>mrgd-F</sub>

=== Model quality indicators ===

=== Model quality indicators ===

−* R and ~~R_free~~: the formula is (LaTex please )

+* R and R<sub>free</sub> : the formula is (LaTex please )

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

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

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== what kind of problems exist with these indicators? ==

== 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<sub>sym</sub> / R<sub>merge</sub> ) should not be used, R<sub>meas</sub> should be used instead (explain why ?)

−- R/~~R_free ~~and NCS: reflections in work and test set are not independant

+- R/R<sub>free</sub> and NCS: reflections in work and test set are not independant

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