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Morrell S, Page A, Taylor R. Birth cohort effects in New South Wales suicide, 1865–1998. Acta Psychiatr Scand 2002; 106: 365–372. On page 367 the sentence containing equation 5 should read:

The following equation was used to estimate second differences in model estimates for contigous age, period or cohort groups:

  • image(5)

such that a differenced series β3−2β2−β1, β4−2β3−β2, ... βn−2βn−1−βn−2 was generated.

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