Classify changes over time using the ISD-system introduced by Galtung (1969).
A vector with length 3
Specify how similar values have to be to be treated as different (optional). Differences smaller than or equal to the tolerance are ignored.
This function implements the ISD-system introduced by Galtung (1969). The input is a vector of length 3. Each value stands for a different point in time. The ISD-system examines the two transition points, and classifies the changes over time.
The function returns a list. The
type returns a number corresponding to the pattern described by Galtung. The
description returns a string where the two transitions are spelled out (increase, flat, decrease).
Galtung, J. (1969) Theory and Methods of Social Research. Oslo: Universitetsforlaget.
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