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In biology often it is of interest to describe life span of an organism. Parametric approach to this problem involves fitting a given probability distribution. Common distributions used here are exponential, Weibul and Gamma. Occasionally other distributions such as inverse Gaussian, log-normal distribution etc. are also fitted. The data refer to age at death of a species of sheep. Age was estimated using skulls. In case of the above data usual distributions failed to give a good fit. There is considerable improvement by using, instead, a quadratic hazard function.

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A data frame with 11 observations on the following 2 variables.

`Age_at_death`

Age at death (years)

`Frequency`

Frequency

Estimate parameters by maximum likelihood and test goodness of fit using chi-square test.

http://ces.iisc.ernet.in/hpg/nvjoshi/statspunedatabook/databook.html

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