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Calculates the proportional change for two sets of numbers.
proportional_change(x, x2)
A numeric object of the proportional change.
A numeric object (vector, matrix or array) of non-negative numbers.
A second numeric object of non-negative numbers.
Other proportional: proportional_difference()
proportional_difference()
proportional_change(1, 2) proportional_change(2, 1)
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