ce</h3>

<p>Data explanation and link can be found at http://lib.stat.cmu.edu/DASL/Stories/airpollutionfilters.html.
</p>


<h3>References</h3>

<p>A.Y. Lewin and M.F. Shakun, Policy Sciences: Methodology and Cases, Pergammon Press, 1976, p 313.
</p>

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