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29 bytes removed ,  10:01, 2 May 2008
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Historically, R-factors were introduced by ... ???
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== Definitions ==
 
== Definitions ==
 
=== Data quality indicators ===
 
=== Data quality indicators ===
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=== Model quality indicators ===
 
=== Model quality indicators ===
* R and R<sub>free</sub> : the formula for both is  
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* R and [[iucr:Free_R_factor|R<sub>free</sub>]] : the formula for both is  
 
  <math>
 
  <math>
 
  R=\frac{\sum_{hkl}\vert F_{hkl}^{obs}-F_{hkl}^{calc}\vert}{\sum_{hkl} F_{hkl}^{obs}}
 
  R=\frac{\sum_{hkl}\vert F_{hkl}^{obs}-F_{hkl}^{calc}\vert}{\sum_{hkl} F_{hkl}^{obs}}
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