A valid response represents one observation of a Variable and its frequency.
The absolute number of occurrences of this observation. Must not be empty.
An optional label for the value of this observation.
The quotient from absoluteFrequency and Distribution.totalAbsoluteFrequency. Must not be empty.
The quotient from absoluteFrequency and Distribution.totalValidAbsoluteFrequency. Must not be empty.
The value which has been observed (e.g. was responded by the participant). Must not be empty and must not contain more than 256 characters.