It means that the 'data' (i.e.: information or statistics) that is given or quoted, is subject to more than one interpretation, or that sources of the data give varying information for the same subject.
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Categorical data varies when there are a variety of different categories.
mean does not mean the center of the data
what do you mean by data assembly?
The mean of a set of data is the sum of that data divided by the number of items of data.
They don't, they become historical data but the facts/numbers are still what they were when the measurement were recoded.