doc/vcdExtra/Geissler.html

<!DOCTYPE html><html><head><title>R: Geissler's Data on the Human Sex Ratio</title>
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<table style="width: 100%;"><tr><td>Geissler</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Geissler's Data on the Human Sex Ratio</h2>

<h3>Description</h3>

<p>Geissler (1889) published data on the distributions of boys and girls in families in 
Saxony, collected for the period 1876-1885. The <code>Geissler</code> data tabulates 
the family composition of 991,958 families by the number of boys and girls
listed in the table supplied by Edwards (1958, Table 1).
</p>


<h3>Usage</h3>

<pre><code class='language-R'>data(Geissler)</code></pre>


<h3>Format</h3>

<p>A data frame with 90 observations on the following 4 variables.  The rows represent the
non-NA entries in Edwards' table.
</p>

<dl>
<dt><code>boys</code></dt><dd><p>number of boys in the family, <code>0:12</code></p>
</dd>
<dt><code>girls</code></dt><dd><p>number of girls in the family, <code>0:12</code></p>
</dd>
<dt><code>size</code></dt><dd><p>family size: <code>boys+girls</code></p>
</dd>
<dt><code>Freq</code></dt><dd><p>number of families with this sex composition</p>
</dd>
</dl>


<h3>Details</h3>

<p>The data on family composition was available because, on the birth of a child,
the parents had to state the sex of all their children on the birth certificate.
These family records are not necessarily independent, because a given family
may have had several children during this 10 year period, included as 
multiple records.
</p>


<h3>Source</h3>

<p>Edwards, A. W. F. (1958).
An Analysis Of Geissler's Data On The Human Sex Ratio.
<em>Annals of Human Genetics</em>, 
23, 6-15.
</p>


<h3>References</h3>

<p>Friendly, M. and Meyer, D. (2016). 
<em>Discrete Data Analysis with R: Visualization and Modeling Techniques for Categorical and Count Data</em>. 
Boca Raton, FL: Chapman &amp; Hall/CRC. <a href="http://ddar.datavis.ca">http://ddar.datavis.ca</a>.
</p>
<p>Geissler, A. (1889).
<em>Beitrage zur Frage des Geschlechts verhaltnisses der Geborenen</em>
Z. K. Sachsischen Statistischen Bureaus, 35, n.p.
</p>
<p>Lindsey, J. K. &amp; Altham, P. M. E. (1998). 
Analysis of the human sex ratio by using overdispersion models.
<em>Journal of the Royal Statistical Society: Series C (Applied Statistics)</em>, 
47, 149-157. 
</p>


<h3>See Also</h3>

<p><code>Saxony</code>, containing the data for families of size 12.
</p>


<h3>Examples</h3>

<pre><code class='language-R'>data(Geissler)
str(Geissler)

# reproduce Saxony data, families of size 12
Saxony12 &lt;- subset(Geissler, size==12, select=c(boys, Freq))
rownames(Saxony12)&lt;-NULL

# make a 1-way table
xtabs(Freq~boys, Saxony12)

# extract data for other family sizes
Saxony11 &lt;- subset(Geissler, size==11, select=c(boys, Freq))
rownames(Saxony11)&lt;-NULL

Saxony10 &lt;- subset(Geissler, size==10, select=c(boys, Freq))
rownames(Saxony10)&lt;-NULL

</code></pre>

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