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<channel>
	<title>IceQuants</title>
	<atom:link href="http://icequants.com/feed/" rel="self" type="application/rss+xml" />
	<link>http://icequants.com</link>
	<description>Financial Science in Iceland</description>
	<pubDate>Fri, 18 Apr 2008 08:29:12 +0000</pubDate>
	<generator>http://wordpress.org/?v=2.6.3</generator>
	<language>en</language>
			<item>
		<title>Zimbabwe</title>
		<link>http://icequants.com/2008/04/18/zimbabwe/</link>
		<comments>http://icequants.com/2008/04/18/zimbabwe/#comments</comments>
		<pubDate>Fri, 18 Apr 2008 08:29:12 +0000</pubDate>
		<dc:creator>Tobbi</dc:creator>
		
		<category><![CDATA[General]]></category>

		<guid isPermaLink="false">http://icequants.com/?p=19</guid>
		<description><![CDATA[Í Zimbabwe er verðbólga um það bil 100.000% síðast þegar ég tékkaði. Almennt atvinnuleysi er um 50-80% - sennilega er það ívíð lægra, og menn vinna bara svart og stunda vöruskipti til að komast hjá bólgunni.
Nú er fréttamenn ekki lengur velkomnir þarna.
Gordon Brown forsætisráðherra Bretlands sakar Mugabe um kosningastuld.
Kínverjar eru nú seljandi þeim vopn as [...]]]></description>
			<content:encoded><![CDATA[<p>Í Zimbabwe er verðbólga um það bil 100.000% síðast þegar ég tékkaði. Almennt atvinnuleysi er um 50-80% - sennilega er það ívíð lægra, og menn vinna bara svart og stunda vöruskipti til að komast hjá bólgunni.</p>
<p>Nú er fréttamenn ekki lengur <a href="http://www.guardian.co.uk/media/2008/apr/17/thetimes.pressandpublishing">velkomnir </a>þarna.</p>
<p>Gordon Brown forsætisráðherra Bretlands sakar Mugabe um <a href="http://www.guardian.co.uk/world/video/2008/apr/17/brown.mugabe">kosningastuld</a>.</p>
<p>Kínverjar eru nú seljandi þeim <a href="http://www.guardian.co.uk/world/2008/apr/18/china.armstrade">vopn </a>as never before.</p>
<p>Spurning hvort þetta sé að þróast út í nýtt Darfur, eða verra.</p>
]]></content:encoded>
			<wfw:commentRss>http://icequants.com/2008/04/18/zimbabwe/feed/</wfw:commentRss>
		</item>
		<item>
		<title>Prostitution office</title>
		<link>http://icequants.com/2008/04/15/prostitution-office/</link>
		<comments>http://icequants.com/2008/04/15/prostitution-office/#comments</comments>
		<pubDate>Tue, 15 Apr 2008 16:11:56 +0000</pubDate>
		<dc:creator>Tobbi</dc:creator>
		
		<category><![CDATA[General]]></category>

		<guid isPermaLink="false">http://icequants.com/?p=18</guid>
		<description><![CDATA[Ég hef lesið um það á netinu í dag að bankarnir hafi leitt 18 ára stúlkukind út í vændi! 
Skúli, þú ert bankamaður, hvernig sefur þú á nóttunni? Hversu margar framhaldsskóla stelpur (jú eða menn) hefur þú neytt útí vændi?
]]></description>
			<content:encoded><![CDATA[<p>Ég hef lesið um það á netinu í dag að bankarnir hafi leitt 18 ára <a href="http://www.freewebs.com/webcamprinsessan/">stúlkukind </a>út í <a href="http://dv.is/frettir/lesa/7514">vændi</a>! </p>
<p>Skúli, þú ert bankamaður, hvernig sefur þú á nóttunni? Hversu margar framhaldsskóla stelpur (jú eða <a href="http://baggalutur.is/index.php?id=4128">menn</a>) hefur þú neytt útí vændi?</p>
]]></content:encoded>
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		</item>
		<item>
		<title>Undarleg viðhorf heima</title>
		<link>http://icequants.com/2008/04/14/undarleg-vi%c3%b0horf-heima/</link>
		<comments>http://icequants.com/2008/04/14/undarleg-vi%c3%b0horf-heima/#comments</comments>
		<pubDate>Mon, 14 Apr 2008 22:10:50 +0000</pubDate>
		<dc:creator>Tobbi</dc:creator>
		
		<category><![CDATA[General]]></category>

		<guid isPermaLink="false">http://icequants.com/?p=17</guid>
		<description><![CDATA[Hér í Bretlandi er efnahagskreppa í aðsigi. Rétt eins og á Íslandi. Markaðir hafa hrapað frá jólum, lán takmörkuð og þá á slæmum kjörum þegar þau bjóðast - rétt eins og á Íslandi. Samt finnst sumum eins og þetta sé íslensku ríkisstjórninni að kenna. Kannski hún sé enn hér við stjórnvölinn frá því &#8220;við&#8221; tókum [...]]]></description>
			<content:encoded><![CDATA[<p>Hér í Bretlandi er <a href="http://www.guardian.co.uk/politics/2008/apr/14/gordonbrown.labour">efnahagskreppa </a>í aðsigi. Rétt eins og á Íslandi. Markaðir hafa hrapað frá jólum, lán takmörkuð og þá á slæmum kjörum þegar þau bjóðast - rétt eins og á Íslandi. Samt finnst sumum eins og þetta sé <a href="http://www.ogmundur.is/annad/nr/3881/">íslensku ríkisstjórninni </a>að kenna. Kannski hún sé enn hér við stjórnvölinn frá því &#8220;við&#8221; tókum UK <a href="http://en.wikipedia.org/wiki/Battle_of_hastings">1066</a>.</p>
<p>Svo verð ég líka að minnast á <a href="http://eyjan.is/silfuregils/2008/04/02/ad-bjarga-bonkum/">heftina </a>sem er gagnvart bönkum heima. <a href="http://eyjan.is/silfuregils/2008/02/07/ofurlaun/">Ofurlaunin </a>og velgengnin eru greinlega orsakir vandans.</p>
]]></content:encoded>
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		</item>
		<item>
		<title>Mathematical Option Pricing</title>
		<link>http://icequants.com/2008/03/19/mathematical-option-pricing/</link>
		<comments>http://icequants.com/2008/03/19/mathematical-option-pricing/#comments</comments>
		<pubDate>Wed, 19 Mar 2008 12:57:27 +0000</pubDate>
		<dc:creator>Tobbi</dc:creator>
		
		<category><![CDATA[General]]></category>

		<guid isPermaLink="false">http://icequants.com/2008/03/19/mathematical-option-pricing/</guid>
		<description><![CDATA[Ég veit ekki til þess að neinn &#8220;non-icelandic speaking&#8221; einstaklingur lesi þetta (eða kannski bara &#8220;speaking&#8221;?) svo þetta hrafl verður á íslensku.
Fyrst. Allir sem lesa þetta vinsamlegast kommentið. Mig langar að sjá hvort það er eitthvað líf í þessari síðu ennþá.
Annað. Ég er currently staddur í Lundúnum og nema fjármálastærðfræði og er að ljúka hér [...]]]></description>
			<content:encoded><![CDATA[<p>Ég veit ekki til þess að neinn &#8220;non-icelandic speaking&#8221; einstaklingur lesi þetta (eða kannski bara &#8220;speaking&#8221;?) svo þetta hrafl verður á íslensku.</p>
<p>Fyrst. Allir sem lesa þetta vinsamlegast kommentið. Mig langar að sjá hvort það er eitthvað líf í þessari síðu ennþá.</p>
<p>Annað. Ég er currently staddur í Lundúnum og nema fjármálastærðfræði og er að ljúka hér námskeiði sem kallast &#8220;Mathematical Option Pricing&#8221;, eða MOP. Þetta námskeið er mjög stærðfræðilegs eðlis og fjallar um grunnstoðir þeirra fræði sem reyna koma á senseable verði á vöru m.t.t. no-arb frumforsendunnar. Ég hef LaTeX&#8217;að whiteboard glósur prófessorsins og reyni að skella þeim hérna á síðuna svo aðrir geti lesið sér til ánægju og yndisauka.</p>
<p>Þriðja. Ég set minn pening á að Exista verði fyrst íslenskra fjármálafyrirtækja til að beila.</p>
<p>Best rgds, Tobbi</p>
]]></content:encoded>
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		</item>
		<item>
		<title>Cholesky decomposition &#038; Correlated Normals</title>
		<link>http://icequants.com/2007/01/31/cholesky-decomposition-correlated-normals/</link>
		<comments>http://icequants.com/2007/01/31/cholesky-decomposition-correlated-normals/#comments</comments>
		<pubDate>Wed, 31 Jan 2007 10:41:24 +0000</pubDate>
		<dc:creator>Skúli</dc:creator>
		
		<category><![CDATA[General]]></category>

		<guid isPermaLink="false">http://icequants.com/2007/01/31/cholesky-decomposition-correlated-normals/</guid>
		<description><![CDATA[I was talking to a friend of mine the other day, about, financial science of course, and the question came up: &#8220;I know that by transforming a vector of uncorrelated normals with the cholesky-factoring the correlation matrix will result in a vector of correlated normals&#8230; but why does that work?&#8221;. I was going to rig [...]]]></description>
			<content:encoded><![CDATA[<p>I was talking to a friend of mine the other day, about, financial science of course, and the question came up: &#8220;I know that by transforming a vector of uncorrelated normals with the cholesky-factoring the correlation matrix will result in a vector of correlated normals&#8230; but why does that work?&#8221;. I was going to rig up the argument in a hurry, in a bar, on the back of a napkin, but I couldn&#8217;t recall it. I promised my friend I&#8217;d give him a very simple one-liner argument and the intention here is to fulfill the promise.</p>
<p>First, recall that the correlation matrix of a vector <img src='/wp-content/plugins/latexrender/pictures/db0460c6340bc81735d78676c84407c7_2.94444pt.gif' title=' \overrightarrow{y} ' alt=' \overrightarrow{y} '  style="vertical-align:-2.94444pt;" > of unit normals is given by</p>
<div style="text-align: center;">
<img src='/wp-content/plugins/latexrender/pictures/816bf485364be7ea38868f500f681545_29.15558pt.gif' title='\displaystyle \Big\langle \overrightarrow{y} \cdot \overrightarrow{y}^\textrm{T} \Big\rangle = \left( \begin{array}{cccc}1 &amp;#038; \rho_{12} &amp;#038; \cdots &amp;#038; \rho_{1N} \\ \rho_{21} &amp;#038; 1 &amp;#038; \vdots &amp;#038; \vdots \\ \vdots &amp;#038; \cdots &amp;#038; \ddots &amp;#038; \rho_{N-1,N} \\ \rho_{N1} &amp;#038; \cdots &amp;#038; \rho_{N,N-1} &amp;#038; 1 \\ \end{array} \right) = \rho ' alt='\displaystyle \Big\langle \overrightarrow{y} \cdot \overrightarrow{y}^\textrm{T} \Big\rangle = \left( \begin{array}{cccc}1 &amp;#038; \rho_{12} &amp;#038; \cdots &amp;#038; \rho_{1N} \\ \rho_{21} &amp;#038; 1 &amp;#038; \vdots &amp;#038; \vdots \\ \vdots &amp;#038; \cdots &amp;#038; \ddots &amp;#038; \rho_{N-1,N} \\ \rho_{N1} &amp;#038; \cdots &amp;#038; \rho_{N,N-1} &amp;#038; 1 \\ \end{array} \right) = \rho '  style="vertical-align:-29.15558pt;" >
</div>
<p>(Notice by the way, that there is an easy fix to the stupid 038 appearing in the matrix, fix explained <a href="http://sixthform.info/steve/wordpress/index.php?cat=2">here</a> but for some reason I don&#8217;t have write access to the file /wp-content/plugins/latexrender/latex.php so we&#8217;ll have to wait for this to be legible.)</p>
<p>Anyway, that was just to recall what the correlation matrix was. Now assume we Cholesky factorize it as follows:</p>
<div style="text-align: center;">
<img src='/wp-content/plugins/latexrender/pictures/07f17a12bc06cc983fd1c6da8410fdf6_2.94444pt.gif' title='\displaystyle C^\textrm{T} \cdot C = \rho ' alt='\displaystyle C^\textrm{T} \cdot C = \rho '  style="vertical-align:-2.94444pt;" >
</div>
<p>and consider the outcome of an uncorrelated vector normal transformed by the cholesky factor:</p>
<div style="text-align: center;">
<img src='/wp-content/plugins/latexrender/pictures/2f581d7f59f0fe48d9f4aeb2902c307a_1.0pt.gif' title='\displaystyle \overrightarrow{z} = C \cdot \overrightarrow{x} ' alt='\displaystyle \overrightarrow{z} = C \cdot \overrightarrow{x} '  style="vertical-align:-1.0pt;" >
</div>
<p>We know that the this must be a unit vector normal, the only thing left to determine is its correlation matrix:</p>
<div style="text-align: center;">
<img src='/wp-content/plugins/latexrender/pictures/00bff8065183302fad93920bbe8984f7_7.50009pt.gif' title='\displaystyle \Big\langle \overrightarrow{z} \cdot \overrightarrow{z}^\textrm{T} \Big\rangle  = \Big\langle C \cdot \overrightarrow{x} \cdot \overrightarrow{x}^\textrm{T} \cdot C^\textrm{T} \Big\rangle' alt='\displaystyle \Big\langle \overrightarrow{z} \cdot \overrightarrow{z}^\textrm{T} \Big\rangle  = \Big\langle C \cdot \overrightarrow{x} \cdot \overrightarrow{x}^\textrm{T} \cdot C^\textrm{T} \Big\rangle'  style="vertical-align:-7.50009pt;" >
</div>
<p>But the cholesky matrix is deterministic and comes out of the expectation, and using the uncorrelated property of <img src='/wp-content/plugins/latexrender/pictures/9dd4e461268c8034f5c8564e155c67a6_1.0pt.gif' title='x' alt='x'  style="vertical-align:-1.0pt;" > we get:</p>
<div style="text-align: center;">
<img src='/wp-content/plugins/latexrender/pictures/09a31a66bbf2b1c8a36edb417ada9934_7.50009pt.gif' title='\displaystyle \Big\langle \overrightarrow{z} \cdot \overrightarrow{z}^\textrm{T} \Big\rangle  = C \cdot \Big\langle \overrightarrow{x} \cdot \overrightarrow{x}^\textrm{T} \Big\rangle \cdot C^\textrm{T} = C \cdot C^\textrm{T} = \rho^\textrm{T} = \rho ' alt='\displaystyle \Big\langle \overrightarrow{z} \cdot \overrightarrow{z}^\textrm{T} \Big\rangle  = C \cdot \Big\langle \overrightarrow{x} \cdot \overrightarrow{x}^\textrm{T} \Big\rangle \cdot C^\textrm{T} = C \cdot C^\textrm{T} = \rho^\textrm{T} = \rho '  style="vertical-align:-7.50009pt;" >
</div>
<p>And since the only thing which prevented the last two equations to fit in one line is the unusually narrow margins here, the argument has been presented as a one-liner.</p>
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		<item>
		<title>LaTeX Renderer Is Here</title>
		<link>http://icequants.com/2007/01/25/latex-renderer-is-here/</link>
		<comments>http://icequants.com/2007/01/25/latex-renderer-is-here/#comments</comments>
		<pubDate>Thu, 25 Jan 2007 23:10:43 +0000</pubDate>
		<dc:creator>Skúli</dc:creator>
		
		<category><![CDATA[General]]></category>

		<guid isPermaLink="false">http://icequants.com/2007/01/25/latex-renderer-is-here/</guid>
		<description><![CDATA[Our beloved admin has honored us with the installation of the LaTeX Renderer&#8230; oh yeah baby!! Now we can actually blog in mathematics! Check this out for example:



There we go with the Black-Scholes SDE model, right here, with LaTeX fonts in a blog. Anyways, I&#8217;m gonna start off with some structured content right now, this [...]]]></description>
			<content:encoded><![CDATA[<p>Our beloved admin has honored us with the installation of the LaTeX Renderer&#8230; oh yeah baby!! Now we can actually blog in mathematics! Check this out for example:</p>
<div style="text-align: center;">
<img src='/wp-content/plugins/latexrender/pictures/cb24121768f32d392f9a3ba93002b3c9_2.94444pt.gif' title=' \textrm{d} X_t = \mu X_t \, \textrm{d} t + \sigma X_t \, \textrm{d} W_t. ' alt=' \textrm{d} X_t = \mu X_t \, \textrm{d} t + \sigma X_t \, \textrm{d} W_t. '  style="vertical-align:-2.94444pt;" >
</div>
<p>There we go with the Black-Scholes SDE model, right here, with LaTeX fonts in a blog. Anyways, I&#8217;m gonna start off with some structured content right now, this is supposed to only be a newsflash.</p>
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		<title>Sælir IceQuants félagar</title>
		<link>http://icequants.com/2007/01/10/s%c3%a6lir-icequants-felagar/</link>
		<comments>http://icequants.com/2007/01/10/s%c3%a6lir-icequants-felagar/#comments</comments>
		<pubDate>Wed, 10 Jan 2007 16:44:06 +0000</pubDate>
		<dc:creator>Skúli</dc:creator>
		
		<category><![CDATA[General]]></category>

		<guid isPermaLink="false">http://icequants.com/2007/01/10/s%c3%a6lir-icequants-felagar/</guid>
		<description><![CDATA[Sælir allir IceQuants félagar!! Þótt það séu kannski ekki lengur neinar nýjar fréttir þá eru það engu að síður fréttir að ég er hættur hjá Landsbankanum. Þið vitið þetta allir, enda erum við ekki margir meðlimirnir hér. Ég vona nafið á mínum vinnustað hafi engin áhrif á þessa IceQuants pælingu okkar, enda átti þetta að [...]]]></description>
			<content:encoded><![CDATA[<p>Sælir allir IceQuants félagar!! Þótt það séu kannski ekki lengur neinar nýjar fréttir þá eru það engu að síður fréttir að ég er hættur hjá Landsbankanum. Þið vitið þetta allir, enda erum við ekki margir meðlimirnir hér. Ég vona nafið á mínum vinnustað hafi engin áhrif á þessa IceQuants pælingu okkar, enda átti þetta að vera &#8220;inter-institutional&#8221; frá upphafi.</p>
<p>Mig langar að gera smá tilraun með það hversu margir eru að lesa hér og hverjir eru aktívir notendur. Hver sem sér þetta entry verður strax að gera comment á það, segja bara &#8220;hæ, ég las þetta&#8221; svo við getum séð hversu langan tíma það tekur þar til allir hafa svarað.</p>
<p>Svo er það annað&#8230; ég keypti nýju útgáfuna af &#8220;Arbitrage Theory in Continuous Time&#8221; eftir Tomas Björk. Þessi bók er &#8220;by-the-way&#8221; snilld. Nýja útgáfan hefur að geyma talsvert dýpri meðferð á stochastic processum og málfræði fyrir þá sem fíla það, en samt er hægt að lesa hana í gegn án þess (hann merkir erfiða kafla með stjörnu). Mæli eindregið með þessari. Ég keypti líka ágætis undergrad texta sem fjallar um stoch. prósessa. Ég keypti hana vegna þess að hún tekur á þessum Poisson prósessum (flestar tala bara um Weiner prósessa). Ég kem með gagnrýni á þessa bók þegar ég er búinn að lesa meira í henni.</p>
<p>Thats all folks.</p>
<p>Skúli</p>
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		</item>
		<item>
		<title>LaTeX renderer</title>
		<link>http://icequants.com/2006/11/13/latex-renderer/</link>
		<comments>http://icequants.com/2006/11/13/latex-renderer/#comments</comments>
		<pubDate>Mon, 13 Nov 2006 01:17:20 +0000</pubDate>
		<dc:creator>Skúli</dc:creator>
		
		<category><![CDATA[General]]></category>

		<guid isPermaLink="false">http://icequants.com/2006/11/13/latex-renderer/</guid>
		<description><![CDATA[Someone should seriously check out the so-called LaTeX renderer for WP. Appearently it is set up as a plugin but there is some level of &#8220;hacking&#8221; needed. Someone would have to set up latex on the server as well which of course requires the help of our honourable Admin. Well, if anyone finds the time [...]]]></description>
			<content:encoded><![CDATA[<p>Someone should seriously check out the so-called LaTeX renderer for WP. Appearently it is set up as a plugin but there is some level of &#8220;hacking&#8221; needed. Someone would have to set up latex on the server as well which of course requires the help of our honourable Admin. Well, if anyone finds the time this would be an awesome addition to the site:</p>
<p><a href="http://sixthform.info/steve/wordpress/index.php?cat=2">Using LaTeX in WordPress</a></p>
<p>Well so that would of course be cool but I&#8217;m not really the right guy to do it, so if any of you webwiz&#8217;s find the instructions on the above site clear and easy to follow, please go ahead!!</p>
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		</item>
		<item>
		<title>IceQuants.com is now Live</title>
		<link>http://icequants.com/2006/11/12/icequantscom-is-now-live/</link>
		<comments>http://icequants.com/2006/11/12/icequantscom-is-now-live/#comments</comments>
		<pubDate>Sun, 12 Nov 2006 14:45:46 +0000</pubDate>
		<dc:creator>Skúli</dc:creator>
		
		<category><![CDATA[General]]></category>

		<guid isPermaLink="false">http://icequants.com/2006/11/12/icequantscom-is-now-live/</guid>
		<description><![CDATA[As a first post on this site a brief introduction is probably in order. The site, IceQuants.com, as the name suggests, is a website intended for quants in Iceland or with quant-interests related to Iceland to have an open discussion. It is truly inter-institutional, meaning that the site has nothing to do with our respective [...]]]></description>
			<content:encoded><![CDATA[<p>As a first post on this site a brief introduction is probably in order. The site, IceQuants.com, as the name suggests, is a website intended for quants in Iceland or with quant-interests related to Iceland to have an open discussion. It is truly inter-institutional, meaning that the site has nothing to do with our respective jobs (in fact, any direct talk about work belongs elsewhere).</p>
]]></content:encoded>
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