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Qualifier variables describe the results of an observation with text or numeric is divided into 5 subclass which are listed below

1.Grouping Qualifiers—These are used to group together a collection of observations within the same domain.

2. Synonym Qualifier—- It specify the alternative name of a particular variables.

3. Result qualifier— It describes the specific result associated with the topic variable for a is the answer to the question raised by the topic variable.

4. Variable qualifier– These are used to further modify or describe a specific variable within an observation and it only meaningful in the context of the variable if they qualify.

5. Record qualifier-it defines the additional attributes of the observations.

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