Discrete
numerical
Categorical Narrative
Constant in space and time
A1 A2 A3
4Varies in time, not in space
B1 B2 B3
Varies in space, not in time
C1 C2 C3
It is noticed that the matrix is in reality three-dimensional
(source, type, nature). Thus, the
categories type and nature
are not mutually exclusive, and it may be
argued that the ma-
trix should be modified in such a way that the
two uncer
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