Figure 3From: Detecting contaminated birthdates using generalized additive modelsEstimated poisson intensity λ(d) for weekdays between 1925 and 1970. It reveals a seasonal pattern of child birth. It also shows a period of decreased birth rate during the ‘Great Depression’ (in the 1930s) and a period of increased birth rate during the post-war baby boom (between 1946 and 1961).Back to article page