NominalVariableValues

class tangles.convenience.NominalVariableValues(var: SurveyVariable)

A nominal SurveyVariableValues class.

The values a nominal variable can take is represented as set of possible values. This set is taking specifications of features corresponding to this variable into account, making it a subset of all possible values of this variable.

Parameters

varSurveyVariable

Corresponding survey variable.

Methods

invert_op()	Invert an operation contained in a metadata tuple
possible_values_representation()	Return a representation of the possible values the corresponding variable can take (according to specifications seen so far)
update_values_for_specification()	Update the list of possible values a variable can take