An actuarial assumption is an estimate of an uncertain variable input into a financial model, normally for the purposes of calculating premiums or benefits. For example, a common actuarial assumption relates to predicting a person's lifespan, given their age, gender, health conditions and other factors. Actuaries use large tables of statistical data which correlate the uncertain variable to a variety of key predictive variables. Given the values for the predictive variables a sound actuarial assumption can be made for the uncertain variable.
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