Sheeplife: Fitting probability distribution to life data of Sheeps

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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.




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


Age at death (years)




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


gpk documentation built on May 20, 2017, 1:31 a.m.
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