Abstract
This note uses an example to show that the adjusted pendulum described by Morton (1992) will not always give more accurate predictions than will the unadjusted pendulum. However, by pointing out that the adjusted pendulum is essentially equivalent to a simple model of the swing-seats relationship, the note argues that the adjusted pendulum is still to be preferred to the unadjusted pendulum. This is because it is an unbiased predictor of net seat change, whereas the unadjusted pendulum is a biased predictor, i.e. it will not on average predict the correct value.
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