---
data_dictionary: fruitfly.dat.txt

copyright: >
  This dataset is copyrighted by the authors of the Journal of Statistics 
  Education article, but should be available for individual educational uses
  under the Fair Use provisions of copyright law.

description: >
  Does access to mating affect the lifespan of fruitflies? This data shows the
  longevity of male fruitflies in the presence or absence of female fruitflies
  to mate with. Male fruitflies were housed with 0, 1, or 8 females. In some
  groups, the females were pregnant and thus not available for mating. There are
  two covariates, length of the thorax and percentage of time sleeping, that
  might also influence longevity.

source: 
  - Partridge, L., and Farquhar, M. (1981), "Sexual Activity and the Lifespan of
    Male Fruitflies," Nature, 294, 580-581.
  - James A. Hanley & Stanley H. Shapiro. Sexual Activity and the Lifespan of 
    Male Fruitflies. A Dataset That Gets Attention. Journal of Statistics 
    Education v.2, n.1 (1994)

additional_description:
  https://jse.amstat.org/datasets/fruitfly.txt

download_url:
  https://jse.amstat.org/datasets/fruitfly.dat.txt

format:
  fixed width

varnames: 
  not included
  
missing_value_code:
  not needed
  
size:   
  rows: 125
  columns: 6

vars:
  id:
    columns: 1-2
    
  partners:
    columns: 4
    label: Number of female partners
    values: 0, 1, or 8
    
  type:
    columns: 6
    label: Type of female fruitfly
    values: 
      0: newly pregnant female
      1: virgin female
      9: not applicable (when partners=0)

  longevity:
    columns: 8-9
    label: Lifespan
    unit: days
    range: positive
    
  thorax:
    columns: 11-14
    label: Length of thorax
    unit: mm
    range: positive
  
  sleep:
    columns: 16-17
    label: Percentage of each day sleeping
    range: 0 to 100
---