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Just a note

One example of this related to changes in the sex ratio of a rural population in South Africa in relation to age.

The normal relationship shows a decline in the proportion of young black males to well below 0.5 as they leave the rural area to work in the mines. The proportion later increases as they return, only to die early from mining related lung diseases.

Suspicion was aroused when the sex ratio in one data set remained absolutely constant over time!