It is ratio; it has a natural zero and differences in values are meaningful.
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A system diagram is known as a first level DFD (Level 0 DFD) A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system.
No, it is not.
Aggregating it may raise its classification level.
Aggregating it may raise its classification level
It can be computer for ordinal level data or higher. It is NOT effected by extremely large or small numbers