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	<title>Comments on: How Probability Works</title>
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	<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/</link>
	<description>Random samplings from a universe of ideas.</description>
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		<title>By: Robert Garisto</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-191382</link>
		<dc:creator>Robert Garisto</dc:creator>
		<pubDate>Sat, 29 Oct 2011 15:30:32 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-191382</guid>
		<description>It depends on what your prior probability is for the hypothesis, &#039;the coin tosses are all fair&#039; (depending on whatever other information you would use if this were a real world situation).  If, for whatever reason, you take that prior probability very very close to 1 (say because you&#039;d tested the coin yourself), then you&#039;d predict the heads-on-next-flip probability to be very close to 1/2.  The professional gambler is a cynic and assigns a nonzero probability to unfairness somewhere. She has the right strategy provided it&#039;s an even money bet.  She would be a fool to pay odds to someone though, unless she had evidence of unfairness.  Put it this way, the odds of 10 heads in a row is 1024:1, but far fewer than 1 coin in 1000 is unfair.  So a random coin which results in 10 heads in a row is still likely to be fair. (The most likely explanation for a random coin coming up heads 10 times is that the coin is fair and there was a statistical fluctuation.)

But if it is 100 heads in a row, Hamlet is having you &lt;a href=&quot;http://en.wikipedia.org/wiki/Rosencrantz_and_Guildenstern_Are_Dead&quot; rel=&quot;nofollow&quot;&gt;killed&lt;/a&gt;.</description>
		<content:encoded><![CDATA[<p>It depends on what your prior probability is for the hypothesis, &#8216;the coin tosses are all fair&#8217; (depending on whatever other information you would use if this were a real world situation).  If, for whatever reason, you take that prior probability very very close to 1 (say because you&#8217;d tested the coin yourself), then you&#8217;d predict the heads-on-next-flip probability to be very close to 1/2.  The professional gambler is a cynic and assigns a nonzero probability to unfairness somewhere. She has the right strategy provided it&#8217;s an even money bet.  She would be a fool to pay odds to someone though, unless she had evidence of unfairness.  Put it this way, the odds of 10 heads in a row is 1024:1, but far fewer than 1 coin in 1000 is unfair.  So a random coin which results in 10 heads in a row is still likely to be fair. (The most likely explanation for a random coin coming up heads 10 times is that the coin is fair and there was a statistical fluctuation.)</p>
<p>But if it is 100 heads in a row, Hamlet is having you <a href="http://en.wikipedia.org/wiki/Rosencrantz_and_Guildenstern_Are_Dead" rel="nofollow">killed</a>.</p>
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		<title>By: Phillip Helbig</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-180819</link>
		<dc:creator>Phillip Helbig</dc:creator>
		<pubDate>Mon, 19 Sep 2011 18:41:18 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-180819</guid>
		<description>&lt;I&gt;&quot;A professional gambler would say, “There must be something wrong with the coin or the way it is being flipped. I wouldn’t bet with the guy flipping it, but I’d bet someone else that heads will come up again.”&quot;&lt;/I&gt;

Jimmy the Greek said that he could make money from gambling in Vegas because he never played the games; he would do things like &quot;I bet that blackjack player will bust on the next round&quot; and make bets on the outcomes of the games.</description>
		<content:encoded><![CDATA[<p><i>&#8220;A professional gambler would say, “There must be something wrong with the coin or the way it is being flipped. I wouldn’t bet with the guy flipping it, but I’d bet someone else that heads will come up again.”&#8221;</i></p>
<p>Jimmy the Greek said that he could make money from gambling in Vegas because he never played the games; he would do things like &#8220;I bet that blackjack player will bust on the next round&#8221; and make bets on the outcomes of the games.</p>
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		<title>By: Sam Cox</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-179844</link>
		<dc:creator>Sam Cox</dc:creator>
		<pubDate>Thu, 15 Sep 2011 21:59:18 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-179844</guid>
		<description>A few additional thoughts....

1. The chance that a cylinder of vast length would stand on either end approaches zero
2  The chance that the cylinder will remain on its third surface approaches one.
3. The two ends are plane surfaces
4. The third surface is circular
5. The lower dimensional similarity to Euclidean SRT....local flat space and GR with its marginally closed spheroid geometry.
6. The overall stability of the sytem
7. The possbility of motion and change as the cylinder rolls in a certain direction.....</description>
		<content:encoded><![CDATA[<p>A few additional thoughts&#8230;.</p>
<p>1. The chance that a cylinder of vast length would stand on either end approaches zero<br />
2  The chance that the cylinder will remain on its third surface approaches one.<br />
3. The two ends are plane surfaces<br />
4. The third surface is circular<br />
5. The lower dimensional similarity to Euclidean SRT&#8230;.local flat space and GR with its marginally closed spheroid geometry.<br />
6. The overall stability of the sytem<br />
7. The possbility of motion and change as the cylinder rolls in a certain direction&#8230;..</p>
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		<title>By: Sam Cox</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-179664</link>
		<dc:creator>Sam Cox</dc:creator>
		<pubDate>Thu, 15 Sep 2011 06:12:54 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-179664</guid>
		<description>Probability is an integral part of a 4D cross-section of the universe- right down to quantum mechanics! The fact that nothing is completely certain or absolutely impossible, however offers a clue to the possibility that what happens in reality is just about completely certain. The chance that the sun will rise tomorrow appoaches 1, yet there was a time when the sun did not rise and there will be, in the future, a time when the sun no longer rises. My existence was next to impossible-almost 0- but here I am!

Each time a coin flips, so long as great pains are taken to keep the flipping process random, the chance of heads vs tails is exactly the same. However I remind my students a coin has three sides, not two and the chance the coin will stand on end increases as the thickness of the coin increases. If a coin is thick enough and becomes a cylinder, landing on the ends becomes very improbable- and landing on its third side becomes almost certain.

Seen from its proper perspective....its complete perspective, the universe much more clsely approximates a cylinder of vast length than a coin....</description>
		<content:encoded><![CDATA[<p>Probability is an integral part of a 4D cross-section of the universe- right down to quantum mechanics! The fact that nothing is completely certain or absolutely impossible, however offers a clue to the possibility that what happens in reality is just about completely certain. The chance that the sun will rise tomorrow appoaches 1, yet there was a time when the sun did not rise and there will be, in the future, a time when the sun no longer rises. My existence was next to impossible-almost 0- but here I am!</p>
<p>Each time a coin flips, so long as great pains are taken to keep the flipping process random, the chance of heads vs tails is exactly the same. However I remind my students a coin has three sides, not two and the chance the coin will stand on end increases as the thickness of the coin increases. If a coin is thick enough and becomes a cylinder, landing on the ends becomes very improbable- and landing on its third side becomes almost certain.</p>
<p>Seen from its proper perspective&#8230;.its complete perspective, the universe much more clsely approximates a cylinder of vast length than a coin&#8230;.</p>
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		<title>By: Tom Weidig</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-179000</link>
		<dc:creator>Tom Weidig</dc:creator>
		<pubDate>Mon, 12 Sep 2011 13:42:50 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-179000</guid>
		<description>I agree with Ben.

You can take two views:

a. to let yourself be guided by empirical data: in this case, bet on heads.

b. to let yourself be guided by your theoretical understanding: I have no clear evidence to suggest that the coin is not fair, so equal probability. If I have, I will act according to a.

This hinges on what &quot;no clear evidence is&quot;. If you define it as no falsifying evidence, heads coud come up a millions time and you don&#039;t change your stance, because it is not impossible for this to happen with a fair coin. But if a close analysis of the physical coin suggest a physical difference, this will falsify the hypothesis &quot;the coin is not fair&quot; and you act according to a.</description>
		<content:encoded><![CDATA[<p>I agree with Ben.</p>
<p>You can take two views:</p>
<p>a. to let yourself be guided by empirical data: in this case, bet on heads.</p>
<p>b. to let yourself be guided by your theoretical understanding: I have no clear evidence to suggest that the coin is not fair, so equal probability. If I have, I will act according to a.</p>
<p>This hinges on what &#8220;no clear evidence is&#8221;. If you define it as no falsifying evidence, heads coud come up a millions time and you don&#8217;t change your stance, because it is not impossible for this to happen with a fair coin. But if a close analysis of the physical coin suggest a physical difference, this will falsify the hypothesis &#8220;the coin is not fair&#8221; and you act according to a.</p>
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		<title>By: Ben</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-178509</link>
		<dc:creator>Ben</dc:creator>
		<pubDate>Sun, 11 Sep 2011 04:26:12 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-178509</guid>
		<description>In a strictly frequentist approach, you would say that based on the data, the maximum likelihood estimate of the probability of the coin coming up head is 1, so there is no reason whatsoever - purely based on the data - to bet on tails. 

In a Bayesian approach, you would look at the probability of the coin coming up head as a random variable, with is own prior distribution. The prior can be anything that describes your prior assumptions about the coin, before observing any flips. Some people may be very confident that the coin must be fair and they trust the coin flipper to be fair too - this would mean that their posterior belief, after observing 10 consecutive heads, would only shift by a little bit towards heads. Other priors are also possible. 
However, one thing is clear: unless your prior distribution has a bias towards TAILS, you will always infer that a HEAD is more likely on the 11th flip.</description>
		<content:encoded><![CDATA[<p>In a strictly frequentist approach, you would say that based on the data, the maximum likelihood estimate of the probability of the coin coming up head is 1, so there is no reason whatsoever &#8211; purely based on the data &#8211; to bet on tails. </p>
<p>In a Bayesian approach, you would look at the probability of the coin coming up head as a random variable, with is own prior distribution. The prior can be anything that describes your prior assumptions about the coin, before observing any flips. Some people may be very confident that the coin must be fair and they trust the coin flipper to be fair too &#8211; this would mean that their posterior belief, after observing 10 consecutive heads, would only shift by a little bit towards heads. Other priors are also possible.<br />
However, one thing is clear: unless your prior distribution has a bias towards TAILS, you will always infer that a HEAD is more likely on the 11th flip.</p>
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		<title>By: JW Mason</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176734</link>
		<dc:creator>JW Mason</dc:creator>
		<pubDate>Wed, 07 Sep 2011 04:20:41 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176734</guid>
		<description>This is a really important point.

In all kinds of thought experiments and logic puzzles (and in, like, every paper ever in moral philosophy), we&#039;re told, &quot;Assume you&#039;re in situation X&quot; and then asked to reason in some way from there. But the real world is never like that. Whatever information we have, we&#039;re using not just to draw some conclusion conditional on being in situation X, but also to update our prior as to whether we really are in X.

What makes it trickier is that in social contexts we all have some very strong priors that we can&#039;t articulate clearly, or that we&#039;re not even conscious of.</description>
		<content:encoded><![CDATA[<p>This is a really important point.</p>
<p>In all kinds of thought experiments and logic puzzles (and in, like, every paper ever in moral philosophy), we&#8217;re told, &#8220;Assume you&#8217;re in situation X&#8221; and then asked to reason in some way from there. But the real world is never like that. Whatever information we have, we&#8217;re using not just to draw some conclusion conditional on being in situation X, but also to update our prior as to whether we really are in X.</p>
<p>What makes it trickier is that in social contexts we all have some very strong priors that we can&#8217;t articulate clearly, or that we&#8217;re not even conscious of.</p>
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		<title>By: Fred</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176723</link>
		<dc:creator>Fred</dc:creator>
		<pubDate>Wed, 07 Sep 2011 03:17:40 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176723</guid>
		<description>ok jt512, sorry if i seemed impolite.</description>
		<content:encoded><![CDATA[<p>ok jt512, sorry if i seemed impolite.</p>
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		<title>By: jt512</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176720</link>
		<dc:creator>jt512</dc:creator>
		<pubDate>Wed, 07 Sep 2011 03:09:44 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176720</guid>
		<description>Well, Fred, I guess I have to concede that you&#039;re right here.  Most references that I can find that define &quot;uncorrelated&quot; defines it in terms of the covariance, rather than the correlation coefficient.

I don&#039;t think, though, that that misunderstanding implies that I&#039;m  &quot;deeply confused about basic statistics.&quot;</description>
		<content:encoded><![CDATA[<p>Well, Fred, I guess I have to concede that you&#8217;re right here.  Most references that I can find that define &#8220;uncorrelated&#8221; defines it in terms of the covariance, rather than the correlation coefficient.</p>
<p>I don&#8217;t think, though, that that misunderstanding implies that I&#8217;m  &#8220;deeply confused about basic statistics.&#8221;</p>
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		<title>By: Fred</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176705</link>
		<dc:creator>Fred</dc:creator>
		<pubDate>Wed, 07 Sep 2011 01:38:38 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176705</guid>
		<description>@jt512 23, one defines X and Y to be uncorrelated when the covariance Cov(X,Y)=E(XY)-E(X)E(Y)=0. Lets assign Heads=+1 and Tails=-1. Then in the case in which the probability of Heads is 1, then E(XY)=1 and E(X)=E(Y)=1, and therefore Cov(X,Y)=1-1*1=0, and so they are clearly uncorrelated. jt512 seems to be deeply confused about basic statistics; this would be fine, if not for the fact that jt512 is putting themself out there as some kind of expert and so critical of everyone else.</description>
		<content:encoded><![CDATA[<p>@jt512 23, one defines X and Y to be uncorrelated when the covariance Cov(X,Y)=E(XY)-E(X)E(Y)=0. Lets assign Heads=+1 and Tails=-1. Then in the case in which the probability of Heads is 1, then E(XY)=1 and E(X)=E(Y)=1, and therefore Cov(X,Y)=1-1*1=0, and so they are clearly uncorrelated. jt512 seems to be deeply confused about basic statistics; this would be fine, if not for the fact that jt512 is putting themself out there as some kind of expert and so critical of everyone else.</p>
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		<title>By: Austin Frisch</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176691</link>
		<dc:creator>Austin Frisch</dc:creator>
		<pubDate>Tue, 06 Sep 2011 23:38:27 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176691</guid>
		<description>As a former professional gambler, I&#039;ve had the best of it after going all and lost 10 times in a row, on more than one occasion. Typically, I then proceeded to dig out some of my teeth with a grapefruit spoon.</description>
		<content:encoded><![CDATA[<p>As a former professional gambler, I&#8217;ve had the best of it after going all and lost 10 times in a row, on more than one occasion. Typically, I then proceeded to dig out some of my teeth with a grapefruit spoon.</p>
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		<title>By: jt512</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176659</link>
		<dc:creator>jt512</dc:creator>
		<pubDate>Tue, 06 Sep 2011 21:58:26 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176659</guid>
		<description>@Tony.  I concur: 11/12, using a uniform prior.</description>
		<content:encoded><![CDATA[<p>@Tony.  I concur: 11/12, using a uniform prior.</p>
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		<title>By: jt512</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176654</link>
		<dc:creator>jt512</dc:creator>
		<pubDate>Tue, 06 Sep 2011 21:35:52 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176654</guid>
		<description>Actually, the question isn&#039;t about correlation or independence; it&#039;s about what the probability of the next flip being heads is.  However, if the probability of &quot;heads&quot; is 1 (as it appears that it may be), then the trials are still statistically independent, but their correlation is undefined.   So, no, Fred, &quot;uncorrelated&quot; does not mean the same thing as &quot;independent&quot; if the trials are Bernoulli.</description>
		<content:encoded><![CDATA[<p>Actually, the question isn&#8217;t about correlation or independence; it&#8217;s about what the probability of the next flip being heads is.  However, if the probability of &#8220;heads&#8221; is 1 (as it appears that it may be), then the trials are still statistically independent, but their correlation is undefined.   So, no, Fred, &#8220;uncorrelated&#8221; does not mean the same thing as &#8220;independent&#8221; if the trials are Bernoulli.</p>
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		<title>By: Ken</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176531</link>
		<dc:creator>Ken</dc:creator>
		<pubDate>Tue, 06 Sep 2011 15:59:47 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176531</guid>
		<description>Don&#039;t forget the &lt;a href=&quot;http://www.shamusyoung.com/twentysidedtale/?p=1223&quot; rel=&quot;nofollow&quot;&gt;gamer&#039;s explanation&lt;/A&gt;.   It combines the novice gambler&#039;s naive understanding of probability with the profession gambler&#039;s immediate &quot;I can exploit this to my advantage&quot;.</description>
		<content:encoded><![CDATA[<p>Don&#8217;t forget the <a href="http://www.shamusyoung.com/twentysidedtale/?p=1223" rel="nofollow">gamer&#8217;s explanation</a>.   It combines the novice gambler&#8217;s naive understanding of probability with the profession gambler&#8217;s immediate &#8220;I can exploit this to my advantage&#8221;.</p>
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		<title>By: Tony P</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176524</link>
		<dc:creator>Tony P</dc:creator>
		<pubDate>Tue, 06 Sep 2011 15:12:54 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176524</guid>
		<description>We can do this - let&#039;s check the math folks - a Bayesian would find the probability of heads to be 11/12?</description>
		<content:encoded><![CDATA[<p>We can do this &#8211; let&#8217;s check the math folks &#8211; a Bayesian would find the probability of heads to be 11/12?</p>
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		<title>By: Scott Aaronson</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176501</link>
		<dc:creator>Scott Aaronson</dc:creator>
		<pubDate>Tue, 06 Sep 2011 12:55:35 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176501</guid>
		<description>A theoretical computer scientist might say: &quot;choosing a prior distribution over possible sequences of coin flips where each sequence gets weighted by 2 to the minus its &lt;a href=&quot;http://en.wikipedia.org/wiki/Kolmogorov_complexity&quot; rel=&quot;nofollow&quot;&gt;Kolmogorov complexity&lt;/a&gt;, and given the outcomes of the first ten flips, we find that &#039;heads every time&#039; gets assigned an overwhelmingly large posterior probability; therefore, I agree with the professional gambler.&quot;

&lt;b&gt;General Lesson:&lt;/b&gt; Any time we find that &quot;math&quot; disagrees with reality, the problem is never with &quot;math&quot;---it&#039;s with &lt;i&gt;us&lt;/i&gt;, for using the &lt;i&gt;wrong&lt;/i&gt; math! :-)</description>
		<content:encoded><![CDATA[<p>A theoretical computer scientist might say: &#8220;choosing a prior distribution over possible sequences of coin flips where each sequence gets weighted by 2 to the minus its <a href="http://en.wikipedia.org/wiki/Kolmogorov_complexity" rel="nofollow">Kolmogorov complexity</a>, and given the outcomes of the first ten flips, we find that &#8216;heads every time&#8217; gets assigned an overwhelmingly large posterior probability; therefore, I agree with the professional gambler.&#8221;</p>
<p><b>General Lesson:</b> Any time we find that &#8220;math&#8221; disagrees with reality, the problem is never with &#8220;math&#8221;&#8212;it&#8217;s with <i>us</i>, for using the <i>wrong</i> math! <img src='http://blogs.discovermagazine.com/cosmicvariance/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' /> </p>
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		<title>By: BS vs ML</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176463</link>
		<dc:creator>BS vs ML</dc:creator>
		<pubDate>Tue, 06 Sep 2011 10:44:54 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176463</guid>
		<description>What is really interesting is two different inductive processes competing.

AKA

Black Swan vs Moore&#039;s Law

http://nosingularity.blogspot.com/2011/09/black-swan-vs-moores-law.html</description>
		<content:encoded><![CDATA[<p>What is really interesting is two different inductive processes competing.</p>
<p>AKA</p>
<p>Black Swan vs Moore&#8217;s Law</p>
<p><a href="http://nosingularity.blogspot.com/2011/09/black-swan-vs-moores-law.html" rel="nofollow">http://nosingularity.blogspot.com/2011/09/black-swan-vs-moores-law.html</a></p>
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	<item>
		<title>By: Fred</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176238</link>
		<dc:creator>Fred</dc:creator>
		<pubDate>Tue, 06 Sep 2011 03:38:07 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176238</guid>
		<description>A statistician would use the word &quot;uncorrelated&quot; knowing that it obviously means the same as &quot;independence&quot; when the random variable is binary: heads or tails (although jt512 does not seem to know this trivial fact, even though jt512 claims to be such an expert on statistics and is so critical of other people&#039;s comments).</description>
		<content:encoded><![CDATA[<p>A statistician would use the word &#8220;uncorrelated&#8221; knowing that it obviously means the same as &#8220;independence&#8221; when the random variable is binary: heads or tails (although jt512 does not seem to know this trivial fact, even though jt512 claims to be such an expert on statistics and is so critical of other people&#8217;s comments).</p>
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	</item>
	<item>
		<title>By: jt512</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176235</link>
		<dc:creator>jt512</dc:creator>
		<pubDate>Tue, 06 Sep 2011 02:44:08 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176235</guid>
		<description>A statistician wouldn&#039;t use the word &quot;uncorrelated&quot; when the question is about &lt;i&gt;independence&lt;/i&gt;.  Hopefully, a mathematician who had taken a mathematical statistics course wouldn&#039;t either.</description>
		<content:encoded><![CDATA[<p>A statistician wouldn&#8217;t use the word &#8220;uncorrelated&#8221; when the question is about <i>independence</i>.  Hopefully, a mathematician who had taken a mathematical statistics course wouldn&#8217;t either.</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: Roland Kie</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2011/09/05/how-probability-works/comment-page-1/#comment-176232</link>
		<dc:creator>Roland Kie</dc:creator>
		<pubDate>Tue, 06 Sep 2011 02:15:01 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=7404#comment-176232</guid>
		<description>A determinist would say &#039;It is calculable what it would turn out to be according to how the person&#039;s movement, the movement of the surrounding air, the weight and side of the coin before it was flipped, the moment when the person catches the coin etcetc&#039; but, of course since he won&#039;t heve the power to calculate he wopn&#039;t really have an answer and...then it goes nowhere...slow.</description>
		<content:encoded><![CDATA[<p>A determinist would say &#8216;It is calculable what it would turn out to be according to how the person&#8217;s movement, the movement of the surrounding air, the weight and side of the coin before it was flipped, the moment when the person catches the coin etcetc&#8217; but, of course since he won&#8217;t heve the power to calculate he wopn&#8217;t really have an answer and&#8230;then it goes nowhere&#8230;slow.</p>
]]></content:encoded>
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