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<table width="100%" summary="page for sperm.comp2"><tr><td>sperm.comp2</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Sperm competition data II</h2>

<h3>Description</h3>

<p>Data relating average number of sperm ejaculated per copulation
to physical characterisics of partners involved, for 24 heterosexual couples
from Manchester, UK. </p>


<h3>Usage</h3>

<pre>
data(sperm.comp2)
</pre>


<h3>Format</h3>

<p>A data frame with 10 columns and 24 rows. The columns are:
</p>

<dl>
<dt>pair</dt><dd><p> an identifier for the couple. These labels correspond to those
given in <code>sperm.comp1</code>.</p>
</dd>
<dt>n</dt><dd><p> the number of copulations over which the average sperm count has
been calculated.</p>
</dd>
<dt>count</dt><dd><p> the average sperm count in millions, per copulation.</p>
</dd>
<dt>f.age</dt><dd><p> age of the female, in years.</p>
</dd>
<dt>f.height</dt><dd><p> height of the female, in cm.</p>
</dd>
<dt>f.weight</dt><dd><p>weight of the female, in kg.</p>
</dd>
<dt>m.age</dt><dd><p>age of the male, in years.</p>
</dd>
<dt>m.height</dt><dd><p>height of the male, in cm.</p>
</dd>
<dt>m.weight</dt><dd><p>weight of the male, in kg.</p>
</dd>
<dt>m.vol</dt><dd><p>volume of one male teste in cubic cm.</p>
</dd>
</dl>


<h3>Details</h3>

<p> 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.
</p>


<h3>Source</h3>

<p>Baker, RR and Bellis M.A. (1993) 
'Human sperm competition: ejaculate adjustment by males and the function
of masturbation'.
Animal behaviour 46:861-885
</p>


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