Much of the analysis presented here is based on three kinds of computer programs:
<ol>
<li>A Unix 
<a href = "extract.html"> script and c code </a>
to extract data from the CD-ROM discs,
<li><a href = "mathematica.html"><i>Mathematica </i></a>
code to visualize the data, and
<li><a href = "sas.html">SAS</a> programs to analyze the data.
</ol>
For further details contact De Cola.