r number of packages on the 
CRAN mirror checked on the indicated 
<code>Date</code>.
</p>
</dd>
<dt>Source</dt><dd>
<p>A factor giving the source (person) who 
collected the data.
</p>
</dd>
</dl>



<h3>Details</h3>

<p>This seems to provide the most widely 
available source for data on the growth of 
CRAN, manually recorded by John Fox and 
Spencer Graves.  For a discussion of these 
and related data, see Fox (2009).
</p>
<p>For more detail, see the 
<a href="https://github.com/hadley/cran-packages">CRAN