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	<title>PQ Systems, Inc. &#124; Quality Blog &#187; Stats tips</title>
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	<description>Proof of quality.</description>
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		<title>PQ Systems, Inc. &#124; Quality Blog &#187; Stats tips</title>
		<link>http://blog.pqsystems.com</link>
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		<title>How can I be “in control” if I don’t know what it is?</title>
		<link>http://blog.pqsystems.com/2009/09/02/how-can-i-be-%e2%80%9cin-control%e2%80%9d-if-i-don%e2%80%99t-know-what-it-is/</link>
		<comments>http://blog.pqsystems.com/2009/09/02/how-can-i-be-%e2%80%9cin-control%e2%80%9d-if-i-don%e2%80%99t-know-what-it-is/#comments</comments>
		<pubDate>Wed, 02 Sep 2009 16:29:37 +0000</pubDate>
		<dc:creator>matthewsavage</dc:creator>
				<category><![CDATA[Stats tips]]></category>

		<guid isPermaLink="false">http://blog.pqsystems.com/?p=395</guid>
		<description><![CDATA[I recently received the following question: ‘The process certification program at my company says that in order to certify a process it must be in control, be capable and be centered. Capability is measured by the process Cp and centering is measured by the Cpk. What measurement is used to determine if a process is [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=blog.pqsystems.com&amp;blog=5110862&amp;post=395&amp;subd=pqsystems&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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		<title>Stats Tip: A run of 5? Or 6? The debate continues.</title>
		<link>http://blog.pqsystems.com/2009/06/15/stats-tip-a-run-of-6-or-7-its-your-choice/</link>
		<comments>http://blog.pqsystems.com/2009/06/15/stats-tip-a-run-of-6-or-7-its-your-choice/#comments</comments>
		<pubDate>Mon, 15 Jun 2009 19:36:24 +0000</pubDate>
		<dc:creator>matthewsavage</dc:creator>
				<category><![CDATA[Stats tips]]></category>

		<guid isPermaLink="false">http://blog.pqsystems.com/?p=334</guid>
		<description><![CDATA[I received a lot of e-mails  in response to my last blog entry and a few of you have posted comments on the blog. It is fantastic to see such a lively debate! And while I like to win a debate as much as the next guy, I am more concerned with utility.  After all, [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=blog.pqsystems.com&amp;blog=5110862&amp;post=334&amp;subd=pqsystems&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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			<media:title type="html">matthewsavage</media:title>
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		<media:content url="http://www.pqsystems.com/images/blog-matt.jpg" medium="image">
			<media:title type="html">Matt Savage</media:title>
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		<title>Stats Tip: A run of 6? or 7?</title>
		<link>http://blog.pqsystems.com/2009/05/28/stats-tip-a-run-of-6-or-7/</link>
		<comments>http://blog.pqsystems.com/2009/05/28/stats-tip-a-run-of-6-or-7/#comments</comments>
		<pubDate>Thu, 28 May 2009 20:55:26 +0000</pubDate>
		<dc:creator>matthewsavage</dc:creator>
				<category><![CDATA[Stats tips]]></category>

		<guid isPermaLink="false">http://blog.pqsystems.com/?p=306</guid>
		<description><![CDATA[A CHARTrunner customer in the UK recently contacted me to ask why her control chart was not flagged with an out-of-control condition. Specifically, note the run down of points in her chart. I replied that the out-of-control test that she defined is looking for seven consecutive samples that are decreasing. I agree that a run of points exists;  however, my assertion is that there are six consecutively decreasing points. She counts seven consecutively decreasing points. How [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=blog.pqsystems.com&amp;blog=5110862&amp;post=306&amp;subd=pqsystems&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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		<slash:comments>10</slash:comments>
	
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			<media:title type="html">matthewsavage</media:title>
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		<media:content url="http://www.pqsystems.com/images/blog-matt.jpg" medium="image">
			<media:title type="html">Matt Savage</media:title>
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		<title>Stats Tip: Control limits need to be calculated using the correct method</title>
		<link>http://blog.pqsystems.com/2009/05/01/stat-tip-control-limits-need-to-be-calculated-using-the-correct-method/</link>
		<comments>http://blog.pqsystems.com/2009/05/01/stat-tip-control-limits-need-to-be-calculated-using-the-correct-method/#comments</comments>
		<pubDate>Fri, 01 May 2009 20:08:56 +0000</pubDate>
		<dc:creator>matthewsavage</dc:creator>
				<category><![CDATA[Stats tips]]></category>

		<guid isPermaLink="false">http://blog.pqsystems.com/?p=275</guid>
		<description><![CDATA[I often tell others that a control chart is one of the most effective and easy-to-use quality tools. Some argue that experimental design is more effective. Maybe so, but can you teach a novice experimental design as quickly as you can teach him a control chart? A control chart is a simple tool that works [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=blog.pqsystems.com&amp;blog=5110862&amp;post=275&amp;subd=pqsystems&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">matthewsavage</media:title>
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		<media:content url="http://www.pqsystems.com/images/blog-matt.jpg" medium="image">
			<media:title type="html">Matt Savage</media:title>
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		<title>Stats tip: What everyone ought to know about Cpk vs. Ppk</title>
		<link>http://blog.pqsystems.com/2009/03/13/stats-tip-what-everyone-ought-to-know-about-cpk-vs-ppk/</link>
		<comments>http://blog.pqsystems.com/2009/03/13/stats-tip-what-everyone-ought-to-know-about-cpk-vs-ppk/#comments</comments>
		<pubDate>Fri, 13 Mar 2009 19:40:52 +0000</pubDate>
		<dc:creator>matthewsavage</dc:creator>
				<category><![CDATA[Stats tips]]></category>

		<guid isPermaLink="false">http://blog.pqsystems.com/?p=220</guid>
		<description><![CDATA[In a class on capability analysis that I recently taught, several participants asked: &#8220;What is the difference between Cpk &#38; Ppk?&#8221; The quick answer is… &#8217;1 letter&#8217;. The mathematical answer is that each statistic uses a different calculation for the standard deviation. The practical answer is…&#8217;it depends&#8217;. Now I know, some of you are saying [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=blog.pqsystems.com&amp;blog=5110862&amp;post=220&amp;subd=pqsystems&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://blog.pqsystems.com/2009/03/13/stats-tip-what-everyone-ought-to-know-about-cpk-vs-ppk/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/ec76272c4a80e3ff5939707ae51053e7?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">matthewsavage</media:title>
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		<media:content url="http://www.pqsystems.com/images/blog-matt.jpg" medium="image">
			<media:title type="html">Matt Savage</media:title>
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		<title>Stats tip: Within and between subgroup variation clarified</title>
		<link>http://blog.pqsystems.com/2009/02/03/stat-tip-within-and-between-subgroup-variation-clarified/</link>
		<comments>http://blog.pqsystems.com/2009/02/03/stat-tip-within-and-between-subgroup-variation-clarified/#comments</comments>
		<pubDate>Tue, 03 Feb 2009 15:20:14 +0000</pubDate>
		<dc:creator>matthewsavage</dc:creator>
				<category><![CDATA[Stats tips]]></category>

		<guid isPermaLink="false">http://blog.pqsystems.com/?p=146</guid>
		<description><![CDATA[I received a question after my last blog post asking me to clarify the concept of within and between subgroup variation which is used in calculating Cpk, Cp, Cr, Ppk, Pp, Pr and other statistics. Here is an example I used to help explain the differences. Let&#8217;s say that every day I run about 30 [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=blog.pqsystems.com&amp;blog=5110862&amp;post=146&amp;subd=pqsystems&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
		<wfw:commentRss>http://blog.pqsystems.com/2009/02/03/stat-tip-within-and-between-subgroup-variation-clarified/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
	
		<media:content url="http://0.gravatar.com/avatar/ec76272c4a80e3ff5939707ae51053e7?s=96&#38;d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D96&#38;r=G" medium="image">
			<media:title type="html">matthewsavage</media:title>
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		<media:content url="http://www.pqsystems.com/images/blog-matt.jpg" medium="image">
			<media:title type="html">Matt Savage</media:title>
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		<media:content url="http://www.pqsystems.com/images/blog-020309-caddy.jpg" medium="image" />
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		<title>Stats tip: Help! My Ppk is larger than my Cpk</title>
		<link>http://blog.pqsystems.com/2009/01/29/stats-tip-help-my-ppk-is-larger-than-my-cpk/</link>
		<comments>http://blog.pqsystems.com/2009/01/29/stats-tip-help-my-ppk-is-larger-than-my-cpk/#comments</comments>
		<pubDate>Thu, 29 Jan 2009 14:51:22 +0000</pubDate>
		<dc:creator>matthewsavage</dc:creator>
				<category><![CDATA[Stats tips]]></category>

		<guid isPermaLink="false">http://blog.pqsystems.com/?p=115</guid>
		<description><![CDATA[I often get asked SPC application questions such as: Can Ppk be larger than Cpk? Can Cpk be larger than Cp? Do you recommend CPM, Cpk, Ppk or something else? I prefer to answer these process capability questions with simple one-word answers, but that doesn&#8217;t usually satisfy the quality zealot&#8217;s curiosity. So here&#8217;s the long [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=blog.pqsystems.com&amp;blog=5110862&amp;post=115&amp;subd=pqsystems&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">matthewsavage</media:title>
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		<media:content url="http://www.pqsystems.com/images/blog-matt.jpg" medium="image">
			<media:title type="html">Matt Savage</media:title>
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