Sheeplife: Fitting probability distribution to life data of Sheeps

Description Usage Format Details Source

Description

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.

Usage

1

Format

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

Age_at_death

Age at death (years)

Frequency

Frequency

Details

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

Source

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



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