Description Usage Format Details References

Medfly data from the Carey et al (1992) experiment. There are 1,203,646 uncensored survival times!

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A data frame with 19072 observations on the following 17 variables.

`age`

age at death in days`num`

frequency count of age at death`prcurr`

current proportion male`current`

current density`cohort`

cohort/pupal batch`size`

pupal size`cage`

cage number`female`

female = 1`cumul`

cumulative density`prcumu`

cumulative proportion male`begin`

initial cage density`prbegin`

initial proportion mail`size4`

size group 4`size5`

size group 5`size6`

size group 6`size7`

size group 7`size8`

size group 8

Quoting from Carey et al (1992) “...Pupae were sorted into one of five size classes using a pupal sorter. This enabled size dimorphism to be eliminated as a potential source of sex-specific mortality differences. Approximately, 7,200 medflies (both sexes) of a given size class were maintained in each of 167 mesh covered, 15 cm by 60 cm by 90 cm aluminum cages. Adults were given a diet of sugar and water, ad libitum, and each day dead flies were removed, counted and their sex determined ...”

Carey, J.R., Liedo, P., Orozco, D. and Vaupel, J.W. (1992)
Slowing of mortality rates at older ages in large Medfly cohorts,
*Science,* 258, 457-61.

Koenker, R. and O. Geling (2001) Reappraising Medfly Longevity:
A Quantile Regression Survival Analysis, *J. Am. Stat. Assoc*,
96, 458-468.

Koenker, R. and Jiaying Gu, (2013) “Frailty, Profile Likelihood and Medfly
Mortality,” * Contemporary Developments in Statistical Theory:
A Festschrift for Hira Lal Koul*, S.N. Lahiri, A. Schick, Ashis Sengupta,
and T.N. Sriram, (eds.), Springer.

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