<div dir="ltr">To avoid that larger newspaper <span style="font-family:arial,sans-serif;font-size:13px">will be weighted heavily is by working exclusively with percentages.</span><div style><span style="font-family:arial,sans-serif;font-size:13px">Making the average of the percentages is the next step to have a total percentage for a particular day.</span></div>
<div style><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div style><span style="font-family:arial,sans-serif;font-size:13px">I see:</span></div><div style><span style="font-family:arial,sans-serif;font-size:13px"><br>
</span></div><div style><span style="font-family:arial,sans-serif;font-size:13px">For a single newspaper a particular day: </span></div><div style><span style="font-family:arial,sans-serif;font-size:13px">percentage of coverage in newspaper in a particular day = number of highlighted pixels / number of pixels of that image</span><span style="font-family:arial,sans-serif;font-size:13px"><br>
</span></div><div style><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div style><span style="font-family:arial,sans-serif;font-size:13px">For a day:</span></div><div style><span style="font-family:arial,sans-serif;font-size:13px">percentage of coverage for a day = sum(</span><span style="font-family:arial,sans-serif;font-size:13px">percentage of coverage in newspaper in a particular day)</span><span style="font-family:arial,sans-serif;font-size:13px"> / available number of newspapers that day</span><span style="font-family:arial,sans-serif;font-size:13px"><br>
</span></div><div style><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div style><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div></div><div class="gmail_extra"><br><br>
<div class="gmail_quote">On Wed, Mar 27, 2013 at 3:16 PM, Edward Platt <span dir="ltr"><<a href="mailto:elplatt@media.mit.edu" target="_blank">elplatt@media.mit.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi All,<div><br></div><div>I'm working on fixing the percentages for days when not all newspapers are published. This has led me to wonder about the best way to calculate the total percentage.</div><div>
<br></div><div>The current approach is to divide the total number of highlighted pixels by the total number of pixels. I see two possible problems with this:</div><div>1. Larger format newspapers will be weighted heavily.</div>
<div>2. If papers are scanned at different resolutions, the weighting of each newspaper will depend on its resolution.</div><div><br></div><div>1. seems potentially OK, but 2. seems bad. Is there a standard method for calculating attention across newspapers with different physical sizes?</div>
<div><br></div><div>-Ed</div><span class="HOEnZb"><font color="#888888"><div><div><br></div>-- <br><div>Edward L. Platt<br></div><div>Civic Technology Programmer</div><div>MIT Center for Civic Media</div><div>E15-348</div>
<div><a href="http://civic.mit.edu" target="_blank">http://civic.mit.edu</a></div>
<div><a href="http://elplatt.com" target="_blank">http://elplatt.com</a></div><div><a href="http://twitter.com/edwardlplatt" target="_blank">@EdwardLPlatt</a></div>
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