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Abstract The investigation of mortality variations has asttracted a great deal of interest in recent years. It is well known that, generally speaking, mortality rates have been continually decreasing during a long period. The detailed study of available experience concerning the structure of this movement, and the analysis of its relations to various factors of social and economic development and of its probable causes, obviously constitute a statistical problem of the highest importance. In the trend of mortality, and the deviations caused by temporary influences, essential features of the history of the population concerned are revealed.
Cramér et al. (Mon,) studied this question.