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	<title>Dan Michaud&#039;s Research Blog</title>
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	<description>Day-to-Day Updates...comments/ideas/suggestions welcome!</description>
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		<title>Dan Michaud&#039;s Research Blog</title>
		<link>http://danthewxman.wordpress.com</link>
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		<item>
		<title>Filtering Results from RI/QI Smoothing</title>
		<link>http://danthewxman.wordpress.com/2009/11/18/filtering-results-from-riqi-smoothing/</link>
		<comments>http://danthewxman.wordpress.com/2009/11/18/filtering-results-from-riqi-smoothing/#comments</comments>
		<pubDate>Wed, 18 Nov 2009 21:40:35 +0000</pubDate>
		<dc:creator>Dan Michaud</dc:creator>
				<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[Assimilation]]></category>
		<category><![CDATA[Gaussian]]></category>
		<category><![CDATA[QI]]></category>
		<category><![CDATA[RI]]></category>
		<category><![CDATA[smoothing]]></category>

		<guid isPermaLink="false">http://danthewxman.wordpress.com/?p=149</guid>
		<description><![CDATA[The smoothing algorithm is working smoothly now, with much-improved Gaussian response curves and good results when using to smooth reliability and quality index fields.  Correlation estimates between RI/QI and the variance of N and dN/dt will be following shortly...<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=danthewxman.wordpress.com&amp;blog=8505614&amp;post=149&amp;subd=danthewxman&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://danthewxman.wordpress.com/2009/11/18/filtering-results-from-riqi-smoothing/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/e7681468aa5c895c21f0d4e0ce3da751?s=96&#38;d=identicon&#38;r=G" medium="image">
			<media:title type="html">Dan M</media:title>
		</media:content>

		<media:content url="http://danthewxman.files.wordpress.com/2009/11/gaussian_response_single300ob1.png?w=300" medium="image">
			<media:title type="html">Gaussian Response to Single Observation of 300 N-units</media:title>
		</media:content>

		<media:content url="http://danthewxman.files.wordpress.com/2009/11/qi_unsmoothed.png?w=300" medium="image">
			<media:title type="html">QI_unsmoothed</media:title>
		</media:content>

		<media:content url="http://danthewxman.files.wordpress.com/2009/11/qi_smoothed.png?w=300" medium="image">
			<media:title type="html">QI_smoothed</media:title>
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	</item>
		<item>
		<title>Lessons Learned in the World of Looping Variables</title>
		<link>http://danthewxman.wordpress.com/2009/11/17/lessons-learned-in-the-world-of-looping-variables/</link>
		<comments>http://danthewxman.wordpress.com/2009/11/17/lessons-learned-in-the-world-of-looping-variables/#comments</comments>
		<pubDate>Tue, 17 Nov 2009 16:34:19 +0000</pubDate>
		<dc:creator>Dan Michaud</dc:creator>
				<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[Efficiency]]></category>
		<category><![CDATA[Gaussian]]></category>
		<category><![CDATA[smoothing]]></category>

		<guid isPermaLink="false">http://danthewxman.wordpress.com/?p=143</guid>
		<description><![CDATA[Using "tic" and "toc" in Matlab can help find the slow points of a script which takes TOO LONG to execute.  This technique has shortened one of may script's running times from days to minutes, and might help you in the future too.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=danthewxman.wordpress.com&amp;blog=8505614&amp;post=143&amp;subd=danthewxman&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://danthewxman.wordpress.com/2009/11/17/lessons-learned-in-the-world-of-looping-variables/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
	
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			<media:title type="html">Dan M</media:title>
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	</item>
		<item>
		<title>Help on Gaussian smoothing in polar coordinates&#8230;?</title>
		<link>http://danthewxman.wordpress.com/2009/11/16/help-on-gaussian-smoothing-in-polar-coordinates/</link>
		<comments>http://danthewxman.wordpress.com/2009/11/16/help-on-gaussian-smoothing-in-polar-coordinates/#comments</comments>
		<pubDate>Mon, 16 Nov 2009 21:19:39 +0000</pubDate>
		<dc:creator>Dan Michaud</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://danthewxman.wordpress.com/?p=140</guid>
		<description><![CDATA[Does anyone know how to make an efficient Gaussian smoother in polar coordinates?  I have to recalculate the range (and thus the Gaussian curve) for every point in my domain&#8230;which turns out to be 300*360.  Lots of points, and lots of computational time.  Even truncating the 2-D curve @ 6 km&#8230;I end up with ~8700 points which [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=danthewxman.wordpress.com&amp;blog=8505614&amp;post=140&amp;subd=danthewxman&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://danthewxman.wordpress.com/2009/11/16/help-on-gaussian-smoothing-in-polar-coordinates/feed/</wfw:commentRss>
		<slash:comments>4</slash:comments>
	
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			<media:title type="html">Dan M</media:title>
		</media:content>
	</item>
		<item>
		<title>Filtering RI, QI with a 2-D Gaussian curve</title>
		<link>http://danthewxman.wordpress.com/2009/11/16/filtering-ri-qi-with-a-2-d-gaussian-curve/</link>
		<comments>http://danthewxman.wordpress.com/2009/11/16/filtering-ri-qi-with-a-2-d-gaussian-curve/#comments</comments>
		<pubDate>Mon, 16 Nov 2009 17:57:42 +0000</pubDate>
		<dc:creator>Dan Michaud</dc:creator>
				<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[Gaussian]]></category>
		<category><![CDATA[smoothing]]></category>

		<guid isPermaLink="false">http://danthewxman.wordpress.com/?p=123</guid>
		<description><![CDATA[Today I'll be smoothing the RI and QI fields so that their spatial dimensions are approximately the same.  Shown are plots of the range and Gaussian functions I'll be using.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=danthewxman.wordpress.com&amp;blog=8505614&amp;post=123&amp;subd=danthewxman&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://danthewxman.wordpress.com/2009/11/16/filtering-ri-qi-with-a-2-d-gaussian-curve/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
	
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			<media:title type="html">Dan M</media:title>
		</media:content>

		<media:content url="http://danthewxman.files.wordpress.com/2009/11/2sigma_4km1.png" medium="image">
			<media:title type="html">Boonleng's Smoothing Radius for Refractivity</media:title>
		</media:content>

		<media:content url="http://danthewxman.files.wordpress.com/2009/11/gaussian_curve_left_off.png?w=300" medium="image">
			<media:title type="html">Remainder of 2-D Gaussian Curve</media:title>
		</media:content>

		<media:content url="http://danthewxman.files.wordpress.com/2009/11/range_from_point_18050.png?w=300" medium="image">
			<media:title type="html">Plot of Range from Pixel (180,50)</media:title>
		</media:content>

		<media:content url="http://danthewxman.files.wordpress.com/2009/11/gaussian_curve_point_18050.png?w=300" medium="image">
			<media:title type="html">Gaussian Curve from Pixel (180,50)</media:title>
		</media:content>
	</item>
		<item>
		<title>NSF Meeting (cont&#8217;d)</title>
		<link>http://danthewxman.wordpress.com/2009/11/13/nsf-meeting-contd-plans-for-next-week/</link>
		<comments>http://danthewxman.wordpress.com/2009/11/13/nsf-meeting-contd-plans-for-next-week/#comments</comments>
		<pubDate>Fri, 13 Nov 2009 14:09:22 +0000</pubDate>
		<dc:creator>Dan Michaud</dc:creator>
				<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[Gaussian]]></category>
		<category><![CDATA[QI]]></category>
		<category><![CDATA[RI]]></category>
		<category><![CDATA[variance]]></category>

		<guid isPermaLink="false">http://danthewxman.wordpress.com/?p=67</guid>
		<description><![CDATA[Continuing the thoughts from yesterday&#8217;s post&#8230; Since the comparison is not the greatest (point vs. smoothed measurement), it&#8217;s unfair at this point to make any solid conclusions about the correlation of variance statistics and the reliability index (RI).  However, the preliminary data did show little to no correlation between the variance of N, dN/dt and [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=danthewxman.wordpress.com&amp;blog=8505614&amp;post=67&amp;subd=danthewxman&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://danthewxman.wordpress.com/2009/11/13/nsf-meeting-contd-plans-for-next-week/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
	
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			<media:title type="html">Dan M</media:title>
		</media:content>

		<media:content url="http://danthewxman.files.wordpress.com/2009/11/var_n_oct192009_2_cropped.png" medium="image">
			<media:title type="html">Variance of Absolute Refractivity, ~0200-0330 UTC, October 19 2009</media:title>
		</media:content>

		<media:content url="http://danthewxman.files.wordpress.com/2009/11/ri_oct192009_cropped.png" medium="image">
			<media:title type="html">Reliability Index, ~0200-0330 UTC, October 19 2009</media:title>
		</media:content>
	</item>
		<item>
		<title>NSF Meeting</title>
		<link>http://danthewxman.wordpress.com/2009/11/12/nsf-meeting/</link>
		<comments>http://danthewxman.wordpress.com/2009/11/12/nsf-meeting/#comments</comments>
		<pubDate>Thu, 12 Nov 2009 21:48:03 +0000</pubDate>
		<dc:creator>Dan Michaud</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://danthewxman.wordpress.com/?p=64</guid>
		<description><![CDATA[Today both myself and Nick presented our recent findings to Jidong and Pam, as everyone else was off at Kyoto University for the week. My recent work over the last couple of days has centered around finding variance of absolute refractivity N and scan-to-scan refractivity (~dN/dt) as a function of time and space.  The script [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=danthewxman.wordpress.com&amp;blog=8505614&amp;post=64&amp;subd=danthewxman&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://danthewxman.wordpress.com/2009/11/12/nsf-meeting/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
	
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			<media:title type="html">Dan M</media:title>
		</media:content>
	</item>
		<item>
		<title>Update on Correlation</title>
		<link>http://danthewxman.wordpress.com/2009/11/11/update-on-correlation/</link>
		<comments>http://danthewxman.wordpress.com/2009/11/11/update-on-correlation/#comments</comments>
		<pubDate>Thu, 12 Nov 2009 04:06:28 +0000</pubDate>
		<dc:creator>Dan Michaud</dc:creator>
				<category><![CDATA[Assimilation]]></category>
		<category><![CDATA[RI]]></category>
		<category><![CDATA[variance]]></category>

		<guid isPermaLink="false">http://danthewxman.wordpress.com/?p=55</guid>
		<description><![CDATA[The variance calculations of refractivity and scan-to-scan refractivity look realistic qualitatively, but the big test tomorrow will be plotting maps and time series of all quantities and see if there's any skill in further improving clutter quality using RI and variance statistics.  NSF Meeting @ 2:30!<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=danthewxman.wordpress.com&amp;blog=8505614&amp;post=55&amp;subd=danthewxman&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://danthewxman.wordpress.com/2009/11/11/update-on-correlation/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/e7681468aa5c895c21f0d4e0ce3da751?s=96&#38;d=identicon&#38;r=G" medium="image">
			<media:title type="html">Dan M</media:title>
		</media:content>
	</item>
		<item>
		<title>Correlating Reliability Index (RI) with Variance in Scan-to-Scan and Absolute Refractivity</title>
		<link>http://danthewxman.wordpress.com/2009/11/10/correlating-ri-varn-vardndt/</link>
		<comments>http://danthewxman.wordpress.com/2009/11/10/correlating-ri-varn-vardndt/#comments</comments>
		<pubDate>Tue, 10 Nov 2009 16:51:52 +0000</pubDate>
		<dc:creator>Dan Michaud</dc:creator>
				<category><![CDATA[Assimilation]]></category>
		<category><![CDATA[RI]]></category>
		<category><![CDATA[variance]]></category>

		<guid isPermaLink="false">http://danthewxman.wordpress.com/?p=50</guid>
		<description><![CDATA[Hello all, Today I am working on developing an algorithm which will process one day&#8217;s worth of radar data and output a time series of RI and the variance of scan-to-scan and absolute refractivity.  Since RI is typically calculated over the course of 10 consecutive radar scans, it seems logical to compute variance statistics over [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=danthewxman.wordpress.com&amp;blog=8505614&amp;post=50&amp;subd=danthewxman&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://danthewxman.wordpress.com/2009/11/10/correlating-ri-varn-vardndt/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
	
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			<media:title type="html">Dan M</media:title>
		</media:content>
	</item>
		<item>
		<title>First Post!</title>
		<link>http://danthewxman.wordpress.com/2009/11/10/first-post/</link>
		<comments>http://danthewxman.wordpress.com/2009/11/10/first-post/#comments</comments>
		<pubDate>Tue, 10 Nov 2009 15:50:02 +0000</pubDate>
		<dc:creator>Dan Michaud</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://danthewxman.wordpress.com/?p=43</guid>
		<description><![CDATA[Welcome, and thanks for coming!<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=danthewxman.wordpress.com&amp;blog=8505614&amp;post=43&amp;subd=danthewxman&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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		<slash:comments>0</slash:comments>
	
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			<media:title type="html">Dan M</media:title>
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