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w [2009/08/06 15:41]
clare created
w [2009/08/27 12:21] (current)
clare
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 +**[//​weighting//​ !E  [//​recal_weighting_on_iter//​]]**
 +
 +Used for calculating the //xdd// dependent weighting function  in<​sub>​{{techref_files:​image016.gif?​20x23}}</​sub>,​ see equation Eq. (5‑2). Can be a function of the reserved parameter names X, Yobs, Ycalc and  SigmaYobs. The default is as follows:
 +
 +weighting = 1 / Max(Yobs, 1);
 +
 +In cases where //​weighting//​ is a function of [[#​_Reserved_parameter_names|Ycalc]] then //​recal_weighting_on_iter//​ can be used to recalculate the weighting at the start of refinement iterations. Otherwise the weighting is recalculated at the start of each [[#​k144|refinement cycle]].
 +
 +Note that some goodness of fit indicators such as //r_wp// are a function of //​weighting//,​ see Table 5‑2.
 +
 +**[//​weight_percent_amorphous//​ !E]**
 +
 +Determines the amorphous content in a sample. The phase dependent keyword of //​spiked_phase_measured_weight_percent//​ needs to be defined in order for //​weight_percent_amorphous//​ to be calculated.

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