In estimating for the future, home economics studies, in most cases, it has been to use "cohort" series for the life-cycle analysis, but the available data series are so short in length due to the original data situation of the family budget statistics, that any positive development along cohort series has not been attained so far. We intend to have an idea to fulfil the shortage through a review of the preliminary essays in cohort series and cohort vector analysis.
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