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In this paper I take up some problems on the analytical theory of population which we meet with frequently in practice. Especially I feel regrettable that the value of life expectation is not availabl...e until the computation of a life table is finished. Usually it takes several years that the computation of a life table is finished under the preparation of population census figures. So I want to find a certain experimental fomula about life expectation which can be estimated easily from the crude death rate at that time and formerly calculated life expectation. I start from an assumption on mortality force, and get experimental formula. As the control of these formula, I adopt following method. I calculate estimated values of life expectaion by sex and selected ages, 1935 based on the figures of life expectation of the 5-th life table (based on 1930 census population) and crude death rates of 1930 and 1935. Then I compare these estimated figures with the figures of life expectation of the 6-th life table. (based on 1935 census population) The result is satisfactory I think. Considerable broad age groups both male and female, there exist sufficient agreement between two.続きを見る
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