| sperm.comp2 {gamair} | R Documentation |
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.
Usage
data(sperm.comp2)
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.weight
weight of the female, in kg.
- m.age
age of the male, in years.
- m.height
height of the male, in cm.
- m.weight
weight of the male, in kg.
- m.vol
volume of one male teste in cubic cm.
Details
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.
Source
Baker, RR and Bellis M.A. (1993) 'Human sperm competition: ejaculate adjustment by males and the function of masturbation'. Animal behaviour 46:861-885