Improving the methods for complex retro-forecast analysis and complex forecasting methods based on lagrange interpolation formula of the accounting balance at insurance companies

A new method of complex retro-forecasting analysis and the method of complex forecasting of the balance sheet of insurance companies from in terms of the interests of their management with their theoretical and methodological basis, which are based on the Lagrange interpolation formula, expressed as functions have been proposed. The possibility of practical application of these methods is justified with the help of tests conducted on the basis of the data of the balance sheets of specific insurance companies.