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Wednesday, December 5, 2007

About Taking Risks



The Eidgenoessische Technische Hochschule (ETH) in Zurich, Switzerland, is an astounding institution of higher learning. Literally, the name translates into English as “Federal Technical High School”. "Federal", because the Swiss federal government supports the institution. "Confederal" would be more appropriate, because the Swiss define their nation as the Confederation of the Swiss. The acronym on their trunk stickers reads CH for confederatio helvetiae, which means Confederation of the Swiss in Latin. Latin was the language of the learned when the Swiss founded their Confederation more than 700 years ago with an oath sworn to help each other. “Eidgenossenschaft”, the German term for the Confederation, means comradeship by oath. The ETH is not a High School. That would be a “Gymnasium” in the Teutonic Languages. It is an engineering school. I use statistical analyses frequently. The ETH helps to develop R, which is one of the most powerful and versatile statistics packages available in open source computing.

In the year 2000, the ETH launched a research initiative in risk assessment. When I heard of this idea, I thought: ”Typically Swiss! They always worry about insurance.” When I checked, most projects aimed at assessing risks in civil engineering and catastrophic damage. But, I bet the principles guiding the software find ready application in the assessment of other types of risk. Just a few weeks ago CEO Charles Prince resigned, because his bank had incurred tantamount losses while dabbling in high-risk investments in sub-prime lending (Dan Wilchins and Jonathan Stempel's post on Reuters dated Nov. 2, 2007, with the title "Citigroup CEO Prince to resign: reports"). What did he blame? Faulty software that was making bad predictions on risk! In his testimony before the Committee on Oversight and Government Reform,  Mar. 7, 2008, he blames the models the industry was using. Perhaps, he should have consulted with the ETH, before he decided to go down that road.

Addenda

  • In hindsight, the bank managers heavily relied on these tools in their decisions. However, even at UBS they did not comprehend them well enough to interpret the data correctly (08/01/2008).
  • At yesterday's congressional hearing, Citigroup's former CEO Charles Prince apologized to Americans hurt by the financial crisis that Citigroup helped precipitate in no small part. He believes that risk reporting within the institution at the time was not at fault and followed good practices. Rather, faulty risk assessment caused the bank's enormous losses. He had come to this conclusion already three years ago (see above). However, now responsibility is shifted to the originators of the bad loans. Prince seems to believe that Citigroup was misled by the original lenders' overoptimistic judgment of the customers' ability to service subprime mortgages. As a result, the risk attached to the securitized bundles containing these loans was understimated and the price at which they were sold to investors was overrated. Listen closely (04/09/10)!
  • Contrary to the former CEOs of Lehman Brothers, Citigroup and Washington Mutual, some in the industry understood the risk attached to subprime lending extremely well.

    On Apr. 22, 2010, Carrick Mollenkamp, Mark Whitehouse and Anton Troianovski published an informative chronicle in The Wall Street Journal entitled "The Busted Homes Behind a Big Bet" of the events surrounding a collateralized debt obligation, or CDO for short, named Abacus that achieved notoriety lately as an example for the catastrophic failure of securitized mortgage bundles that precipitated this country's greatest economic crisis since the Great Depression while providing its creators with extraordinary returns.

    In 2007, Paulson & Co., a hedge-fund management company, helped create Abacus 2007-AC1 for institutional investors in collaboration with Goldman Sachs and the portfolio selection-agent ACA Management, LLC. Within the next six months, Abacus would lose 83 percent of its value.

    Paulson & Co. had painstakingly analyzed the mortgages bundled in Abacus and correctly predicted that great losses were inevitable and soon to come. A senior employee of the firm, Paolo Pellegrini, was deeply involved in structuring Abacus. According the Wall Street Journal article, " Mr. Pellegrini and a colleague had purchased an enormous database capable of tracking the characteristics of more than six million mortgages in various parts of the country. They spent long hours scouring it all, according to people familiar with the matter." Paulson and Co. took out insurance against the CDO's demise, cashing out a billion dollars at its end.

    Apparently, correct models for risk assessment and data bases with the necessary information were available to those who wished to come to the right conclusions (04/25/10).
  • This Reuters video report by Bobbi Rebell with the title "Camping out for a change" published today portrays a new political movement that attempts to harness people's feared risk of being set adrift by those with a seemingly insatiable appetite for it. Within the past decade, risk assessment has become the overarching theme of our time (10/10/2011).
    (Thumbnail photo by Lucy Nicholson, Reuters)

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Broken Cups in Your OS X Cupboard

I work a lot with pictures professionally and have been using Apple computers for most of my career, except my Master's Thesis which I wrote on a DEC PDP 11. I was only a user. However, it always struck me with trepidation that I did not understand a thing of what was going on under the hood. I was eventually roped into computing, when the Apple operating system turned to UNIX around the year 2000. With the introduction of OS X, Apple had opened itself to Open Source computing which opened a new universe to me. Seven years later, I spent way more time with compiling packages than I ought to, and way more often than I liked, I ended up in a real fix. Regardless, the euphoria of empowerment outweighed the disappointment by far.

Today I report on one example of the kinds of adventure one may encounter on this road. Several months ago, I happened on the website of cups printing. Cups is the printing routine used in OS X. I found a pre-compiled binary of a more recent version than I had ready for installation. Since I wanted to be at the cutting edge, I downloaded the offering and installed it without reading the fine print. The result was that I could not print anymore. The fine print said that one had to re-install the operating system, if the update did not work. Oh!

I was not prepared to do that. So I compiled the most recent 1.4.x version for developers from source myself and installed it. After that, I could not even get passed the login window. I had a series of sweaty moments since then. I did not believe the functions that depend on cups! Much of OS X appears to depend on the cups library in one way or another. How can this be in the age decentralization? I managed to fix the problem by re-installing n older version in the single user mode.

Months later, I re-visited the cups website. The pre-compiled packages were gone, and it was recommended to try one the versions 1.3.x. After a number of tries, one of them worked and I offer the result on my SourceForge.net project (Software for Small Budget Science). The package is compiled with Tiger on Intel. It has worked well for me. Let my adventure be a warning.



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Monday, December 3, 2007

Leonardo's View

I just was reminded of the great Leonardo da Vinci the other day. A book entitled “La Musica Celata” has just been published in which the author, Giovanni Maria Pala, lays out evidence that a musical theme is embedded in Leonardo's painting of the Last Supper. That Leonardo was truly one of a kind! His drawings and paintings reflect such a keen sense of actuality and maybe more. I am a neuro-anatomist by training. I always admired realistic drawings of the human body. In my mind, Leonardo was the first modern anatomist.

I once could visit a traveling exhibit of his drawings and notes on human anatomy at the Philadelphia College of Physicians. Beside the very impressively detailed renderings of muscles and bones, drawings on the brain caught my eye. On one parchment (Fig. 5), a schema on how the brain may work was center stage. The ventricles, that is the fluid-filled cavities, were of utmost importance. In Leonardo's time, it was commonly accepted that our thoughts, our spirit, would travel with the juice in the ventricles. The nerve cells were discovered only centuries later. However, the Maestro was not going to be fooled. If you train your eye on the lower left corner of the parchment, you discover that what looks like a smudge is the faint impression of a more detailed drawing of brain structure. As if Leonardo tried to draw something as he saw it and then erased it. The other parchment (Fig. 6) shows his method of reproducing the shape of the ventricles by filling them with wax in the bovine brain. On this parchment, again the ventricles take center stage, Yet, on the right side there is another faint drawing. This time, the shape is distinct. You see a very realistic reproduction of the cerebral cortex with its sulci and gyri. Though it may seem human, it is most likely the cortex cerebri of a cow. Yes, also ruminants have a cortex with numerous convolutions. That must have caught the Maestro's eye. I can imagine that he mumbled to himself: ”Only shows the limits of inductive thinking. This proves that cortical convolutions are no key to intellect!” And all the world's cows must have agreed with a resounding:” Moo!”

If you like to see more of Leonardo's notes on human anatomy, check in a book like Leonardo Da Vinci on the Human Body. In his studies, Leonardo was constantly struggling with the unreal views of the day and with the actuality that he saw and could not help, but draw. He must have erased his impression of reality many times, because of his fear of the authorities. Dissecting bodies was forbidden. He wrote his notes on the parchments in mirror image to conceal his thoughts from the average person who may have betrayed him. But, then he could not efface his convictions entirely. In the end, Leonardo's perceptions of the brain were correct, and he stands tall today. What can we learn from this?

Trust your own eyes more than anything, particularly when the views of the day get in the way.


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