{"id":222324,"date":"2025-04-21T11:22:56","date_gmt":"2025-04-21T15:22:56","guid":{"rendered":"https:\/\/ibkrcampus.com\/campus\/?p=222324"},"modified":"2025-04-21T11:23:02","modified_gmt":"2025-04-21T15:23:02","slug":"kris-boudt-part-two-the-r-finance-conference","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/kris-boudt-part-two-the-r-finance-conference\/","title":{"rendered":"Kris Boudt Part Two: The R\/Finance Conference"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em>Read the first installment in this series here: <a href=\"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/kris-boudt-part-one-quant-innovator-professor-entrepreneur\/\">Kris Boudt Part One: Quant Innovator, Professor, Entrepreneur<\/a><\/em>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For many years, Kris Boudt, Professor, quant analyst, and co-founder of advanced textual analysis firm <a href=\"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/gaining-from-non-normality-in-factor-analysis\/\" target=\"_blank\" rel=\"noreferrer noopener\">Sentometrics<\/a>, has been a regular participant in Chicago&#8217;s annual R Finance Conference. His involvement began in 2007 with its precursor, &#8220;The 1st International R\/Rmetrics User and Developer Workshop,&#8221; held in Lake Thune, Switzerland.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;They locked us in a hotel in the Alps, surrounded by beautiful landscapes and not much else. For five days, we had no choice but to interact with each other. A lot of the work happened over meals and beers. It was the most important workshop of my life.&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;I was 23 and full of energy. One morning, I happened to be sitting at breakfast with Brian Peterson, who later became one of the R Finance conference organizers. He&#8217;d developed a package for performance analytics. Over coffee, he asked me, &#8216;Do you know about Cornish\u2013Fisher expansion?&#8217;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;I didn&#8217;t know. It&#8217;s a way to take into account the non-normality of data when you estimate value-at-risk. If you use a normal distribution to estimate the risk of losing money, the estimate is biased. If you use Cornish-Fisher, you take into account skewness and kurtosis. Brian explained all this to me at breakfast, and I thought I had it. Except at lunch, he told me he&#8217;d only explained the easy part, when there&#8217;s just one asset. The difficult part is when there are 10 assets, or 20, and you have to think of your portfolio return in powers of three and four. At those levels, there are so many interactions, so many combinations.&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Between lunch and dinner, Boudt skipped the conference&#8217;s formal activities to focus on devising a solution that might implement Cornish-Fisher.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;I wanted to make a good impression \u2013 and somehow, I found an implementation. But of course, it wasn&#8217;t yet in any package.&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The next day, again over a meal, Boudt and Peterson decided to work together.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;A solution existed for value-at-risk, but not for expected shortfall, which is a better risk measure. So by applying the Cornish-Fisher expansion to estimate expected shortfall we developed a new risk measure. We published the paper in <em>The Journal of Risk<\/em>.&#8221;<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"r\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">library(PerformanceAnalytics)\n# Equally-weighted portfolio with N=4 assets\nN &lt;- 4\ndata(edhec)\nreturns &lt;- edhec[,1:N]\nweights &lt;- matrix(rep(1\/N, N), ncol=1)\n# Robust estimation of first four (co)moments \nrets &lt;- clean.boudt(returns)[[1]]\nmu &lt;- colMeans(rets)\nsigma &lt;- M2.shrink(rets)$M2sh\ncoskew &lt;- M3.shrink(rets)$M3sh\ncokurt &lt;- M4.shrink(rets)$M4sh\n# Compute 5% Cornish Value at Risk for equally-weighted portfolio\nout &lt;- PerformanceAnalytics:::VaR.CornishFisher.portfolio(0.05, \n          weights, mu, sigma, coskew, cokurt)\n# barplot visualization: portfolio VaR vs component contribution\nbarplot(c(out$MVaR ,out$contribution), \n        names.arg = c(\"Portfolio VaR\", colnames(rets)),\n        col = c(\"blue\", \"orange\", \"darkgreen\", \"red\", \"purple\"), \n        main = \"Cornish-Fisher Portfolio Risk Decomposition: \n                Portfolio Value-at-Risk vs. Component Contributions\")<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1100\" height=\"537\" data-src=\"https:\/\/www.interactivebrokers.com\/campus\/wp-content\/uploads\/sites\/2\/2025\/04\/CornishFisherPortfolioRiskDecompositionKrisBoudt-1100x537.png\" alt=\"\" class=\"wp-image-222328 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2025\/04\/CornishFisherPortfolioRiskDecompositionKrisBoudt-1100x537.png 1100w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2025\/04\/CornishFisherPortfolioRiskDecompositionKrisBoudt-700x342.png 700w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2025\/04\/CornishFisherPortfolioRiskDecompositionKrisBoudt-300x146.png 300w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2025\/04\/CornishFisherPortfolioRiskDecompositionKrisBoudt-768x375.png 768w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2025\/04\/CornishFisherPortfolioRiskDecompositionKrisBoudt.png 1504w\" data-sizes=\"(max-width: 1100px) 100vw, 1100px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1100px; aspect-ratio: 1100\/537;\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">Source: Introduction to Portfolio Analysis in R \u2013 DataCamp<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Paper: <a href=\"https:\/\/stat.ethz.ch\/pipermail\/r-help\/2007-February\/125841.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/stat.ethz.ch\/pipermail\/r-help\/\/2007-February\/125841.html<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Boudt says writing that paper while completing his PhD was one of the most productive times of his life.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;I worked European hours, and Brian worked US hours, so we were each working while the other was sleeping. The work informed my PhD, which I completed in two years and three months. It could be some kind of record.&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">All of this came from that small R workshop in Switzerland. In addition to Peterson, Boudt also met <a href=\"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/r-is-for-finance-most-definitely-part-two\/\" target=\"_blank\" rel=\"noreferrer noopener\">Jeff Ryan<\/a> and David Ardia.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;That&#8217;s what the R Finance conference is all about &#8212; forming and engaging with a community. You come together to solve problems. Everyone in the community is entrepreneurial because making a package is like making your own product. After Switzerland, Brian invited me to Chicago, where I became a guest professor at the University of Illinois. That&#8217;s when the next stage of my work began.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Stay tuned for Part Three: Sentometrics, A Match Made in Belgium<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>That&#8217;s what the R Finance conference is all about \u2014 forming and engaging with a community.<\/p>\n","protected":false},"author":1261,"featured_media":222331,"comment_status":"open","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[339,343,338,341,342],"tags":[19179,806,2787,9338,487,11312,6591,19180],"contributors-categories":[13576],"class_list":["post-222324","post","type-post","status-publish","format-standard","has-post-thumbnail","category-data-science","category-programing-languages","category-ibkr-quant-news","category-quant-development","category-r-development","tag-cornish-fisher-portfolio-risk-decomposition","tag-data-science","tag-performanceanalytics","tag-portfolio-analysis","tag-r","tag-r-finance","tag-rstats","tag-sentometrics","contributors-categories-interactive-brokers"],"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is optimized with the 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