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Term: Frequency-Severity Method

29 Oct 2015

DEFINITION of ‘Frequency-Severity Method’
An actuarial method for determining the expected number of claims that an insurer will receive during a given time period, and how much the average claim will cost. Frequency-severity method uses historical data to estimate the average number of claims and the average cost of each claim. The method multiplies the average number of claims by the average cost of a claim.

BREAKING DOWN ‘Frequency-Severity Method’
Insurers use sophisticated models to determine the likelihood that they will have to pay out a claim. Ideally, the insurer would prefer receiving premiums for underwriting new insurance policies without ever having to pay out a claim, but this is a very unlikely scenario. Instead, insurers develop estimates as to how many claims they may expect to see and how expensive the claims will be based on the types of policies they provide to policyholders.

The frequency-severity method is one option that insurers use to develop models. Frequency refers to the number of claims that an insurer expects to see. High frequency means that a large number of claims is expected to come in. Severity refers to the cost of a claim, with high severity claims being more expensive than average estimates and low severity claims being less expensive than the average. The average cost of claims may be estimated based off of historical cost figures.

Because the frequency-severity method looks at past years in determining average costs for future years it is less influenced by more volatile recent periods. This means that it is not reliant on loss development factors based off of more recent years. However, this means that the method is also slower to adapt to increases in volatility. For example, an insurer providing flood insurance will adapt more slowly to an increase in the severity or frequency of flood damage claims caused by recent rising water levels.

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