flies {REBayes}

Medfly Data

Description

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

Usage

flies

Format

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

Details

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 ...”

References

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.