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====== w ======

**[//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.