flies {REBayes} | R Documentation |
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 daysnum
frequency count of age at deathprcurr
current proportion malecurrent
current densitycohort
cohort/pupal batchsize
pupal sizecage
cage numberfemale
female = 1cumul
cumulative densityprcumu
cumulative proportion malebegin
initial cage densityprbegin
initial proportion mailsize4
size group 4size5
size group 5size6
size group 6size7
size group 7size8
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.