====== Weights Type ======

A Weights value stores Weights of Evidence data, used in calibration and simulation. What it holds depends on where it sits in the calibration pipeline: it can represent either a set of pre-defined ranges (intervals) for continuous variables, or a set of computed coefficients for those ranges once calibrated.

[[Determine Weights Of Evidence Ranges]] takes a [[Weights Of Evidence Skeleton Type|Weights Of Evidence Skeleton]] — which variables to use, and how to discretize them — along with a pair of calibration maps, and produces a Weights value holding the resulting ranges. That Weights value then becomes the ''ranges'' input to [[Determine Weights Of Evidence Coefficients]], [[Determine Weights Of Evidence Continuous Occurrences]], and [[Determine Weights Of Evidence Correlation]], each producing its own Weights output — coefficients, for the first two — from it. [[Calc W. Of E. Probability Map]] is the ultimate consumer, using a Weights value of coefficients to compute a spatial probability map.

===== GUI Editor =====

Weights Type has no editor. A value can only be obtained by loading one from a file with [[Load Weights]], or by connecting the output of one of the calibration functors above — never typed in directly.

===== EGO Script =====

For the same reason, Weights Type has no literal constant syntax in [[EGO Script]] — see [[ego_script#constants|Constants]]. Weights values are usually read from an external file using [[Load Weights]] and written using [[Save Weights]], or produced directly by a calibration functor:

<code>
{ woeCoefficients = weights, woeReport = report } := DetermineWeightsOfEvidenceCoefficients initialLandscape finalLandscape ranges;
</code>

===== Automatic Conversions =====

  * **Converted from**: [[Table Type]]. Two column layouts are accepted: ''From*'' (Real), ''To*'' (Real), ''Variable*'' (String), ''Range_Lower_Limit*'' (Real), ''Range_Upper_Limit*'' (Real), ''Weight'' (Real); or the same without ''Range_Upper_Limit''.

  * **Converted to**: [[Table Type]], using the six-column layout above.

See [[type_system|Type System]] for the complete conversion reference across all types.