calculates overall shift difference from a contingency table derived from the crosstabulation between a comparison variable (or variable at time t), and a reference variable (or variable at time t+1). Shift refers to the difference remaining after subtracting quantity difference and exchange from the overall difference.
matrix representing a square contingency table between a comparison variable (rows) and a reference variable (columns)
overall shift difference between the comparison variable and the reference variable. Output values are given in the same units as
Pontius Jr., R.G., Santacruz, A. 2014. Quantity, exchange and shift components of difference in a square contingency table. International Journal of Remote Sensing 35 (21), 7543-7554.
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