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A7.1. The Plus-Minus Proportionate Adjustment technique is a procedure for prorating a distribution with positive and negative frequencies. The procedure minimises the adjustments to the original distribution. It requires the use of two factors, one for the positive frequencies and one for the negative frequencies. The formulae are as follows:
A7.3. The technique is illustrated in the following table where the algebraic sum of the frequencies is adjusted from 10 to 15.
n = 10
N = 15
N - n = 5
Positive Adjustment factor =
Negative Adjustment Factor =