Abstract
Abstract Lidstone's group method, which applies to endowment assurances, is based on the approximation, where a n−t and bn−t depend only on n−t . For a valuatIOn group, consisting of policies with the same unexpired terms, n−t , the mean maturity age y + n is given by the equation, W denoting S or P. Inserting here values by (1) om both sides we arrive at the well-known Z-method: where the quantities on the right hand side, or proportional values, are used as individual policy constants.
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