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	<title>Bayesian Estimation in SPECT</title>
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	<link>http://bayesspect.wordpress.com</link>
	<description>Single Photon Emission Computed Tomography</description>
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		<title>Bayesian Estimation in SPECT</title>
		<link>http://bayesspect.wordpress.com</link>
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			<item>
		<title>Run Time Issues</title>
		<link>http://bayesspect.wordpress.com/2009/04/20/run-time-issues/</link>
		<comments>http://bayesspect.wordpress.com/2009/04/20/run-time-issues/#comments</comments>
		<pubDate>Mon, 20 Apr 2009 09:19:22 +0000</pubDate>
		<dc:creator>J. Q. McClintic</dc:creator>
				<category><![CDATA[Software]]></category>
		<category><![CDATA[challenges]]></category>
		<category><![CDATA[efficiency]]></category>
		<category><![CDATA[next steps]]></category>
		<category><![CDATA[progress]]></category>

		<guid isPermaLink="false">http://bayesspect.wordpress.com/?p=89</guid>
		<description><![CDATA[Okay, I should say I mean this not quite in the normal programmer sort of way. I am worried running a reasonable number of simulations is going to take weeks of computing time on my poor three year old 2.2 GHz AMD Turion 64 laptop.
Part of me (the part which knows the software is single [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bayesspect.wordpress.com&blog=4090232&post=89&subd=bayesspect&ref=&feed=1" />]]></description>
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		<slash:comments>0</slash:comments>
	
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			<media:title type="html">J. Q. McClintic</media:title>
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		<item>
		<title>Not Happy with ABCIMA</title>
		<link>http://bayesspect.wordpress.com/2009/04/12/not-happy-with-abcima/</link>
		<comments>http://bayesspect.wordpress.com/2009/04/12/not-happy-with-abcima/#comments</comments>
		<pubDate>Sun, 12 Apr 2009 08:22:31 +0000</pubDate>
		<dc:creator>J. Q. McClintic</dc:creator>
				<category><![CDATA[Progress]]></category>
		<category><![CDATA[Software]]></category>
		<category><![CDATA[abcima]]></category>
		<category><![CDATA[backward coupling]]></category>
		<category><![CDATA[bcima]]></category>
		<category><![CDATA[challenges]]></category>
		<category><![CDATA[progress]]></category>

		<guid isPermaLink="false">http://bayesspect.wordpress.com/?p=87</guid>
		<description><![CDATA[ABCIMA with the working (and very nice BCIMA software) has failed to achieve. It was a 250 point total sample chain with five 50 point subchains.  The last three each stuck at a single value, all three of which weren&#8217;t anywhere near where they should have been. Rather odd, really, that a single BCIMA run [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bayesspect.wordpress.com&blog=4090232&post=87&subd=bayesspect&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://bayesspect.wordpress.com/2009/04/12/not-happy-with-abcima/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
	
		<media:content url="http://1.gravatar.com/avatar/1c745d73ba3db90231e8f2e3a1581868?s=96&#38;d=identicon" medium="image">
			<media:title type="html">J. Q. McClintic</media:title>
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		<item>
		<title>Chaining Works Now</title>
		<link>http://bayesspect.wordpress.com/2009/04/11/chaining-works-now/</link>
		<comments>http://bayesspect.wordpress.com/2009/04/11/chaining-works-now/#comments</comments>
		<pubDate>Sat, 11 Apr 2009 09:48:57 +0000</pubDate>
		<dc:creator>J. Q. McClintic</dc:creator>
				<category><![CDATA[Software]]></category>
		<category><![CDATA[backward coupling]]></category>
		<category><![CDATA[bcima]]></category>
		<category><![CDATA[progress]]></category>

		<guid isPermaLink="false">http://bayesspect.wordpress.com/?p=84</guid>
		<description><![CDATA[And I got my wish and the backchaining worked. Once again, once I get a chance to upload the images I&#8217;ll post them. Right now it looks really good for a backchain and ran pretty fast too.
Coming up next: a test of the ABCIMA code with the news BCIMA core.
Posted in Software Tagged: backward coupling, [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bayesspect.wordpress.com&blog=4090232&post=84&subd=bayesspect&ref=&feed=1" />]]></description>
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		<slash:comments>0</slash:comments>
	
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			<media:title type="html">J. Q. McClintic</media:title>
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		<title>Bugs in Reverse</title>
		<link>http://bayesspect.wordpress.com/2009/04/11/bugs-in-reverse/</link>
		<comments>http://bayesspect.wordpress.com/2009/04/11/bugs-in-reverse/#comments</comments>
		<pubDate>Sat, 11 Apr 2009 09:37:24 +0000</pubDate>
		<dc:creator>J. Q. McClintic</dc:creator>
				<category><![CDATA[Progress]]></category>
		<category><![CDATA[bcima]]></category>
		<category><![CDATA[bug]]></category>
		<category><![CDATA[progress]]></category>

		<guid isPermaLink="false">http://bayesspect.wordpress.com/?p=80</guid>
		<description><![CDATA[As I noted, there were problems with backward coupling. Oh, it ran, but it wouldn&#8217;t couple. Going back over the .backstep code revealed a small bug. The stop condition I had originally coded was this
checkCondition &#60;- (cauchy/(proposal*truncEff)) - (comp/inf$infimumK);
STOP           &#60;- if(checkCondition &#62;= 0) {TRUE} else [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bayesspect.wordpress.com&blog=4090232&post=80&subd=bayesspect&ref=&feed=1" />]]></description>
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		<slash:comments>0</slash:comments>
	
		<media:content url="http://1.gravatar.com/avatar/1c745d73ba3db90231e8f2e3a1581868?s=96&#38;d=identicon" medium="image">
			<media:title type="html">J. Q. McClintic</media:title>
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		<item>
		<title>Handling A Failure to Couple</title>
		<link>http://bayesspect.wordpress.com/2009/04/09/handing-a-failure-to-couple/</link>
		<comments>http://bayesspect.wordpress.com/2009/04/09/handing-a-failure-to-couple/#comments</comments>
		<pubDate>Thu, 09 Apr 2009 07:04:03 +0000</pubDate>
		<dc:creator>J. Q. McClintic</dc:creator>
				<category><![CDATA[Progress]]></category>
		<category><![CDATA[Software]]></category>
		<category><![CDATA[abcima]]></category>
		<category><![CDATA[bcima]]></category>
		<category><![CDATA[bug]]></category>
		<category><![CDATA[challenges]]></category>
		<category><![CDATA[progress]]></category>

		<guid isPermaLink="false">http://bayesspect.wordpress.com/?p=77</guid>
		<description><![CDATA[I may have found a good way to handle the failure to couple. It works like this:

Check whether or not coupling ocoured.
If so, proceed as normal
If not, skip making the forward chain and return a value of NULL

This should work for one and only one reason (at least with respect to the ABCIMA code) and [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bayesspect.wordpress.com&blog=4090232&post=77&subd=bayesspect&ref=&feed=1" />]]></description>
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		<slash:comments>0</slash:comments>
	
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			<media:title type="html">J. Q. McClintic</media:title>
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		<item>
		<title>Failing Gracefully</title>
		<link>http://bayesspect.wordpress.com/2009/04/09/failing-gracefully/</link>
		<comments>http://bayesspect.wordpress.com/2009/04/09/failing-gracefully/#comments</comments>
		<pubDate>Thu, 09 Apr 2009 06:20:02 +0000</pubDate>
		<dc:creator>J. Q. McClintic</dc:creator>
				<category><![CDATA[Software]]></category>
		<category><![CDATA[abcima]]></category>
		<category><![CDATA[bcima]]></category>
		<category><![CDATA[challenges]]></category>
		<category><![CDATA[efficiency]]></category>
		<category><![CDATA[ima]]></category>
		<category><![CDATA[spect]]></category>
		<category><![CDATA[statistics]]></category>
		<category><![CDATA[testing]]></category>

		<guid isPermaLink="false">http://bayesspect.wordpress.com/2009/04/09/failing-gracefully/</guid>
		<description><![CDATA[I added the code to test whether or not the coupling succeeded or failed. At this point, I also realize while yes, the code does work (just had one fail out on me) simply having it stop isn&#8217;t such a graceful failure. The .backstep function passes a success or failure variable and that&#8217;s a good [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bayesspect.wordpress.com&blog=4090232&post=75&subd=bayesspect&ref=&feed=1" />]]></description>
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		<slash:comments>0</slash:comments>
	
		<media:content url="http://1.gravatar.com/avatar/1c745d73ba3db90231e8f2e3a1581868?s=96&#38;d=identicon" medium="image">
			<media:title type="html">J. Q. McClintic</media:title>
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		<item>
		<title>ABCIMA Results and Run Time Issues</title>
		<link>http://bayesspect.wordpress.com/2009/04/09/abcima-results-and-run-time-issues/</link>
		<comments>http://bayesspect.wordpress.com/2009/04/09/abcima-results-and-run-time-issues/#comments</comments>
		<pubDate>Thu, 09 Apr 2009 02:50:09 +0000</pubDate>
		<dc:creator>J. Q. McClintic</dc:creator>
				<category><![CDATA[Software]]></category>
		<category><![CDATA[abcima]]></category>
		<category><![CDATA[bcima]]></category>
		<category><![CDATA[progress]]></category>
		<category><![CDATA[spect]]></category>
		<category><![CDATA[testing]]></category>

		<guid isPermaLink="false">http://bayesspect.wordpress.com/?p=72</guid>
		<description><![CDATA[Yesterday I did a trial run of the ABCIMA software which ran to completion. It also took forever to run. While the image indicates an okay estimate (the most recent BCIMA run was actually better . . . not sure why) If the results of the eventual set of numerical experiments don&#8217;t bear out significantly [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bayesspect.wordpress.com&blog=4090232&post=72&subd=bayesspect&ref=&feed=1" />]]></description>
		<wfw:commentRss>http://bayesspect.wordpress.com/2009/04/09/abcima-results-and-run-time-issues/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
	
		<media:content url="http://1.gravatar.com/avatar/1c745d73ba3db90231e8f2e3a1581868?s=96&#38;d=identicon" medium="image">
			<media:title type="html">J. Q. McClintic</media:title>
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		<title>Waiting For ABCIMA Test Results</title>
		<link>http://bayesspect.wordpress.com/2009/04/08/waiting-for-abcima-test-results/</link>
		<comments>http://bayesspect.wordpress.com/2009/04/08/waiting-for-abcima-test-results/#comments</comments>
		<pubDate>Wed, 08 Apr 2009 08:38:27 +0000</pubDate>
		<dc:creator>J. Q. McClintic</dc:creator>
				<category><![CDATA[Progress]]></category>
		<category><![CDATA[abcima]]></category>
		<category><![CDATA[bcima]]></category>
		<category><![CDATA[progress]]></category>
		<category><![CDATA[Software]]></category>

		<guid isPermaLink="false">http://bayesspect.wordpress.com/?p=70</guid>
		<description><![CDATA[I&#8217;m sitting here waiting for the last fifty datapoints of what could be my first successful ABCIMA analysis run ever to compute.
How do I know I&#8217;m down to the last fifty? There&#8217;s a little piece of legacy code that tells me when the backchain portion of the BCIMA process completed. So I know when I [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bayesspect.wordpress.com&blog=4090232&post=70&subd=bayesspect&ref=&feed=1" />]]></description>
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		<slash:comments>0</slash:comments>
	
		<media:content url="http://1.gravatar.com/avatar/1c745d73ba3db90231e8f2e3a1581868?s=96&#38;d=identicon" medium="image">
			<media:title type="html">J. Q. McClintic</media:title>
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		<title>Testing the ABCIMA Code</title>
		<link>http://bayesspect.wordpress.com/2009/04/08/testing-the-abcima-code/</link>
		<comments>http://bayesspect.wordpress.com/2009/04/08/testing-the-abcima-code/#comments</comments>
		<pubDate>Wed, 08 Apr 2009 07:19:38 +0000</pubDate>
		<dc:creator>J. Q. McClintic</dc:creator>
				<category><![CDATA[Progress]]></category>
		<category><![CDATA[abcima]]></category>
		<category><![CDATA[bcima]]></category>
		<category><![CDATA[bug]]></category>
		<category><![CDATA[Software]]></category>
		<category><![CDATA[spect]]></category>
		<category><![CDATA[statistics]]></category>
		<category><![CDATA[testing]]></category>

		<guid isPermaLink="false">http://bayesspect.wordpress.com/?p=68</guid>
		<description><![CDATA[That&#8217;s exactly what&#8217;s happening right now.I&#8217;m killing time while the code runs. It&#8217;s really slow. So far the only bugs have been a couple typos and forgetting that R&#8217;s Single Value Decomposition function returns the diagonal elements of the diagonal matrix as a vector not as a matrix. We&#8217;ll see what else crops up in [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bayesspect.wordpress.com&blog=4090232&post=68&subd=bayesspect&ref=&feed=1" />]]></description>
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		<slash:comments>0</slash:comments>
	
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			<media:title type="html">J. Q. McClintic</media:title>
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		<title>Time</title>
		<link>http://bayesspect.wordpress.com/2009/04/07/time/</link>
		<comments>http://bayesspect.wordpress.com/2009/04/07/time/#comments</comments>
		<pubDate>Tue, 07 Apr 2009 08:44:56 +0000</pubDate>
		<dc:creator>J. Q. McClintic</dc:creator>
				<category><![CDATA[Goal]]></category>
		<category><![CDATA[abcima]]></category>
		<category><![CDATA[bcima]]></category>
		<category><![CDATA[ima]]></category>
		<category><![CDATA[next steps]]></category>
		<category><![CDATA[Software]]></category>

		<guid isPermaLink="false">http://bayesspect.wordpress.com/2009/04/07/time/</guid>
		<description><![CDATA[Turns out using the command Sys.time() it is possible to get a nice, intuitive computation of how long it takes for various pieces of code to run. This is getting added to the eventual list of things to do for the IMA, BCIMA, and ABCIMA code in order to facilitate some sort of breakdown of [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bayesspect.wordpress.com&blog=4090232&post=67&subd=bayesspect&ref=&feed=1" />]]></description>
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		<slash:comments>0</slash:comments>
	
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			<media:title type="html">J. Q. McClintic</media:title>
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