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The paper considers the so-called cohort method of accounting aggregates insurance portfolios. In insurance statistics systematization and processing of aggregate data on the issued policies, premiums and insurance payments are often made with gross errors, because ones don't set the criteria written policies and related payments to the analyzed statistical universe. Besides, it is often not clearly specify the scheme of calculation of aggregate statistical associated with these policies. The study gives a detailed and rigorous presentation as a method of formation of different cohorts data for a specified period of assessment the aggregated characteristics and methods of calculation of interest to insurance of indicators (absolute and relative) for these cohorts. The knowledge of these methods is necessary for a correct assessment of insurance premiums and reserves.