There various datasets around showing correlations between numbers of storks and numbers of births, although differences in changes over time. Usually they are described as having been observed in Sweden. I seem to remember one set in a Genstat manual. I have been asked about an unreferenced set I used in an article in abput 1980, although I think it was later. I have been using a version recently to teach abput the Bradfprd Hill criteria.
Does anyone have any referenced source of such data?
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