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Estimation, Evaluation, and Selection of Actuarial Models

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8 CHAPTER 2. MODEL ESTIMATION<br />

<strong>and</strong> then<br />

H(x) =<br />

Z x<br />

−∞<br />

h(y)dy.<br />

The distribution function can be obtained from F (x) =1−S(x) =1−e −H(x) .Therefore,estimating<br />

the cumulative hazard function provides an alternative way to estimate the distribution function.<br />

In order to define empirical estimates, some additional notation is needed. For a sample <strong>of</strong> size<br />

n, lety 1

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