sperm.comp2: Sperm competition data II
Description
Data relating average number of sperm ejaculated per copulation
to physical characterisics of partners involved, for 24 heterosexual couples
from Manchester, UK. Format
A data frame with 10 columns and 24 rows. The columns are:
- pair an identifier for the couple. These labels correspond to those
given in
sperm.comp1.
- n the number of copulations over which the average sperm count has
been calculated.
- count the average sperm count in millions, per copulation.
- f.age age of the female, in years.
- f.height height of the female, in cm.
- f.weightweight of the female, in kg.
- m.ageage of the male, in years.
- m.heightheight of the male, in cm.
- m.weightweight of the male, in kg.
- m.volvolume of one male teste in cubic cm.
Source
Baker, RR and Bellis M.A. (1993)
`Human sperm competition: ejaculate adjustment by males and the function
of masturbation'.
Animal behaviour 46:861-885Details
In the source article, these data are used to argue that males
invest more reproductive effort in heavier females, on the basis of regression
modelling. It is worth checking for outliers.