What is Expected Loss Ratio MEthod (ELR) and where it is used?
ELR Method?
Expected loss ratio (ELR method) is a technique used to determine the projected amount of claims, relative to earned premiums. The expected loss ratio (ELR) method is used when an insurer lacks the appropriate past claims occurrence data to provide because of changes to its product offerings and when it lacks a large enough sample of data for long-tail product lines. It is used to calculate the Ultimate Claims further it calculates the IBNR.
Source: https://theactuarialclub.com/2019/05/18/expected-loss-ratio-elr-method/