Wednesday, September 30, 2009
DNA-Based Investing Strategies - Barrons.com
DNA-Based Investing Strategies - Barrons.com: "Science can tell the difference between nature and nurture. Personal investing strategies are based on genes, brain patterns, and human experience. Columnist Jason Zweig goes to the University of Pittsburgh to uncover whether science can tell whether he is more guided by his nature, or by his life."
Wednesday, November 26, 2008
How Scientists Helped Cause Our Financial Crisis
Garbage in, Garbage out. Models are not reality. Models only help explain reality and therefore help our understanding of a reality that is generally too complex to fully grasp.
These ideas are taught in every stats, econometrics, and finance class worth its weight. On every test students use (indeed sometimes overuse) "data limitations", "it uses historical data", and "surprises (or black swans) can occur that would make our model incorrect" as problems with such and such model. And yet somehow, quantitative geniuses (or at least the traders and managers who relied on the models) seeming forgot (uh, looked the other way?) and ignored the problems.
So how did so many smart people seemingly forget? In part they were paid to forget (bonuses, promotions for big successes with little accounting for risks taken--for more of this see Taleb's "Fooled by Randomness".
Scientific America and ClusterStock look at this issue in How Scientists Helped Cause Our Financial Crisis
"In retrospect, the financial planning by our most sophisticated financial institution looks incredibly stupid. Merrill Lynch never included in its plans the risk that its counterparties could demand more collateral. Citigroup proceeded to dive headlong into the mortgage market on the assumption that a national housing decline was impossible. Everyone, it seems, failed to guard against the risk that they might be forced to sell assets to raise capital during a downturn. So it's worth asking: how did so many rich guys get so dumb?"
Scientific America quoted in the same piece:
"The causes of this fiasco are multifold—the Federal Reserve’s easy-money policy played a big role—but the rocket scientists and geeks also bear their share of the blame....The government bailout has already left the U.S. Treasury and Federal Reserve with extraordinary powers. The regulators must ensure that the many lessons of this debacle are not forgotten by the institutions that trade these securities. One important take-home message: capital safety nets (now restored) should never be slashed again, even if a crisis is not looming.
For its part, the quant community needs to undertake a search for better models—perhaps seeking help from behavioral economics, which studies irrationality of investors’ decision making, and from virtual market tools that use “intelligent agents” to mimic more faithfully the ups and downs of the activities of buyers and sellers....risk management models should serve only as aids not substitutes for the critical human factor. Like an airplane, financial models can never be allowed to fly solo."
Remember, models are representations of reality. Economic models, no matter how super, are no more reality than are super models are representations of the average Joe (or Jill or Jim or Jerry or Jane).
These ideas are taught in every stats, econometrics, and finance class worth its weight. On every test students use (indeed sometimes overuse) "data limitations", "it uses historical data", and "surprises (or black swans) can occur that would make our model incorrect" as problems with such and such model. And yet somehow, quantitative geniuses (or at least the traders and managers who relied on the models) seeming forgot (uh, looked the other way?) and ignored the problems.
So how did so many smart people seemingly forget? In part they were paid to forget (bonuses, promotions for big successes with little accounting for risks taken--for more of this see Taleb's "Fooled by Randomness".
Scientific America and ClusterStock look at this issue in How Scientists Helped Cause Our Financial Crisis
"In retrospect, the financial planning by our most sophisticated financial institution looks incredibly stupid. Merrill Lynch never included in its plans the risk that its counterparties could demand more collateral. Citigroup proceeded to dive headlong into the mortgage market on the assumption that a national housing decline was impossible. Everyone, it seems, failed to guard against the risk that they might be forced to sell assets to raise capital during a downturn. So it's worth asking: how did so many rich guys get so dumb?"
Scientific America quoted in the same piece:
"The causes of this fiasco are multifold—the Federal Reserve’s easy-money policy played a big role—but the rocket scientists and geeks also bear their share of the blame....The government bailout has already left the U.S. Treasury and Federal Reserve with extraordinary powers. The regulators must ensure that the many lessons of this debacle are not forgotten by the institutions that trade these securities. One important take-home message: capital safety nets (now restored) should never be slashed again, even if a crisis is not looming.
For its part, the quant community needs to undertake a search for better models—perhaps seeking help from behavioral economics, which studies irrationality of investors’ decision making, and from virtual market tools that use “intelligent agents” to mimic more faithfully the ups and downs of the activities of buyers and sellers....risk management models should serve only as aids not substitutes for the critical human factor. Like an airplane, financial models can never be allowed to fly solo."
Remember, models are representations of reality. Economic models, no matter how super, are no more reality than are super models are representations of the average Joe (or Jill or Jim or Jerry or Jane).
Friday, November 30, 2007
An Airline Shrugs at Oil Prices - New York Times
An Airline Shrugs at Oil Prices - New York Times:
"Southwest owns long-term contracts to buy most of its fuel through 2009 for what it would cost if oil were $51 a barrel. The value of those hedges soared as oil raced above $90 a barrel, and they are now worth more than $2 billion. Those gains will mostly be realized over the next two years. Other major airlines passed on buying all but the shortest-term insurance against high fuel prices..."
That other airlines were not hedging (or at least not hedging long-term) has been one of my pet peeves going back as far as the newsletter days. Sure it costs money to hedge, and sure is not without some risks (see for instance this story on what happened when oil prices fell), but hedging makes too much sense not to do.
How does hedging work? Why? The best explanation I have ever seen comes from an old Corporate text book I once used by Rao (do not think it is still in print and I can not find my copy). In it he described how hedging allows management to worry about what they do well and can control (service, pricing, safety etc) and not what they can not control (oil prices in this case).
An other view (the two views are definitely NOT mutually exclusive) is that hedgers have both better access to capital markets and less need to go when the asset (oil) moves in teh 'wrong' direction. My favorite paper in this area has long been Carter, Rogers, and Simkins.
Of course that said, all of the good I can say about hedging goes out the window if firms use the same derivatives to speculate.
Thanks to Felix over at Conde Nast's Porfolio.com for the heads-up on this one.
"Southwest owns long-term contracts to buy most of its fuel through 2009 for what it would cost if oil were $51 a barrel. The value of those hedges soared as oil raced above $90 a barrel, and they are now worth more than $2 billion. Those gains will mostly be realized over the next two years. Other major airlines passed on buying all but the shortest-term insurance against high fuel prices..."
That other airlines were not hedging (or at least not hedging long-term) has been one of my pet peeves going back as far as the newsletter days. Sure it costs money to hedge, and sure is not without some risks (see for instance this story on what happened when oil prices fell), but hedging makes too much sense not to do.
How does hedging work? Why? The best explanation I have ever seen comes from an old Corporate text book I once used by Rao (do not think it is still in print and I can not find my copy). In it he described how hedging allows management to worry about what they do well and can control (service, pricing, safety etc) and not what they can not control (oil prices in this case).
An other view (the two views are definitely NOT mutually exclusive) is that hedgers have both better access to capital markets and less need to go when the asset (oil) moves in teh 'wrong' direction. My favorite paper in this area has long been Carter, Rogers, and Simkins.
Of course that said, all of the good I can say about hedging goes out the window if firms use the same derivatives to speculate.
Thanks to Felix over at Conde Nast's Porfolio.com for the heads-up on this one.
An Airline Shrugs at Oil Prices - New York Times
An Airline Shrugs at Oil Prices - New York Times:
"Southwest owns long-term contracts to buy most of its fuel through 2009 for what it would cost if oil were $51 a barrel. The value of those hedges soared as oil raced above $90 a barrel, and they are now worth more than $2 billion. Those gains will mostly be realized over the next two years. Other major airlines passed on buying all but the shortest-term insurance against high fuel prices..."
That other airlines were not hedging (or at least not hedging long-term) has been one of my pet peeves going back as far as the newsletter days. Sure it costs money to hedge, and sure is not without some risks (see for instance this story on what happened when oil prices fell), but hedging makes too much sense not to do.
How does hedging work? Why? The best explanation I have ever seen comes from an old Corporate text book I once used by Rao (do not think it is still in print and I can not find my copy). In it he described how hedging allows management to worry about what they do well and can control (service, pricing, safety etc) and not what they can not control (oil prices in this case).
An other view (the two views are definitely NOT mutually exclusive) is that hedgers have both better access to capital markets and less need to go when the asset (oil) moves in teh 'wrong' direction. My favorite paper in this area has long been Carter, Rogers, and Simkins.
Of course that said, all of the good I can say about hedging goes out the window if firms use the same derivatives to speculate.
Thanks to Felix over at Conde Nast's Porfolio.com for the heads-up on this one.
"Southwest owns long-term contracts to buy most of its fuel through 2009 for what it would cost if oil were $51 a barrel. The value of those hedges soared as oil raced above $90 a barrel, and they are now worth more than $2 billion. Those gains will mostly be realized over the next two years. Other major airlines passed on buying all but the shortest-term insurance against high fuel prices..."
That other airlines were not hedging (or at least not hedging long-term) has been one of my pet peeves going back as far as the newsletter days. Sure it costs money to hedge, and sure is not without some risks (see for instance this story on what happened when oil prices fell), but hedging makes too much sense not to do.
How does hedging work? Why? The best explanation I have ever seen comes from an old Corporate text book I once used by Rao (do not think it is still in print and I can not find my copy). In it he described how hedging allows management to worry about what they do well and can control (service, pricing, safety etc) and not what they can not control (oil prices in this case).
An other view (the two views are definitely NOT mutually exclusive) is that hedgers have both better access to capital markets and less need to go when the asset (oil) moves in teh 'wrong' direction. My favorite paper in this area has long been Carter, Rogers, and Simkins.
Of course that said, all of the good I can say about hedging goes out the window if firms use the same derivatives to speculate.
Thanks to Felix over at Conde Nast's Porfolio.com for the heads-up on this one.
Monday, October 29, 2007
The News-Gazette.com:Top salaries continue to rise as UI competes for talent
Well this was sent to me, it is not to as a means of saying so and so gets too much, merely to report that it really is a different world. This is from the University of Illinois.
The News-Gazette.com:Top salaries continue to rise as UI competes for talent :
"As of fall 2006, the average salary for a full-time professor at the UI was $95,700, up $13,400 or 16 percent since 2002. When comparing that average salary to those at the 21 institutions, the UI ranks third from the bottom, behind Michigan, Texas and North Carolina but ahead of Washington and Wisconsin....In recent years, as turnovers have occurred in high-level positions at the university, salaries for new employees have often risen well above the predecessor's pay. Four years ago, the UI's vice president for technology and economic development, David Chicoine, earned $262,500. UI College of Business Dean Avijit Ghosh will assume that post in January and earn $339,000....Of the more than 100 people who earn $200,000 or more at the UI, many are in the business and law schools. And many hold endowed chairs, meaning some of the salary is funded by a donor.Such top faculty earners include finance Professor Jeff Brown, who has the title of William Karnes Professor of Mergers and Acquisitions, and a salary of $245,000;"
This does show how much salaries can vary. At small schools (such as SBU) it may take the sum of four years to make that much. :( Oh well...having traveled to mid Ohio, Orlando, and NYC in the last three weeks, I can definitely say I would not want to trade places.
The News-Gazette.com:Top salaries continue to rise as UI competes for talent :
"As of fall 2006, the average salary for a full-time professor at the UI was $95,700, up $13,400 or 16 percent since 2002. When comparing that average salary to those at the 21 institutions, the UI ranks third from the bottom, behind Michigan, Texas and North Carolina but ahead of Washington and Wisconsin....In recent years, as turnovers have occurred in high-level positions at the university, salaries for new employees have often risen well above the predecessor's pay. Four years ago, the UI's vice president for technology and economic development, David Chicoine, earned $262,500. UI College of Business Dean Avijit Ghosh will assume that post in January and earn $339,000....Of the more than 100 people who earn $200,000 or more at the UI, many are in the business and law schools. And many hold endowed chairs, meaning some of the salary is funded by a donor.Such top faculty earners include finance Professor Jeff Brown, who has the title of William Karnes Professor of Mergers and Acquisitions, and a salary of $245,000;"
This does show how much salaries can vary. At small schools (such as SBU) it may take the sum of four years to make that much. :( Oh well...having traveled to mid Ohio, Orlando, and NYC in the last three weeks, I can definitely say I would not want to trade places.
Saturday, October 27, 2007
Do Finance Profs practice what they preach?
Sometimes the most important finding of an article is not played up while lesser items (especially those that appear to more exciting or controversial) are given more play. For instance from SmartMoney:
Finance Profs Reveal How They Invest Own Money (The Pro Shop) | SmartMoney.com:
"Colby Wright, assistant professor of finance at Central Michigan University and James Doran, finance professor at Florida State University, [survey] ... finance professors. After all, they're arguably the most educated and well-informed people when it comes to understanding the mysteries behind stock price movements. [I think the article somehow left out 'best looking", funniest, and "nicest" as well.] So Wright and Doran set out to survey all the professors of finance in the U.S. and ask what's most important to them when investing their own money. The survey resulted in 642 usable responses. They published their results earlier this year in a paper titled 'What Really Matters When Buying and Selling Stocks?"
The findings were not exactly what we would think. For instance the survey suggests that PE ratios, market multiples, and momentum investing are among the keys and not CAPM, efficient markets and the market risk factors.
"Out of 43 variables given, the most important were a company's price/earnings ratio and how close a stock is to its 52-week high to low. Considering the material most finance professors teach their students as a way of explaining stock price movements — like the capital asset pricing model and discounted cash flows — Wright calls the findings surprising"
Which is true to a degree, but virtually all finance classes also cover market multiples, such as PE ratios, in some format. For instance in my classes I harp on the fact that both Discounted CAsh Flow analysis and multiples are really doing something very similar just in a different way and there is a place for both. In fact, we generally say that the time to perform a DCF projection is often not worth it for small investments.
Had that been the entire story it MIGHT have been blog worthy. However, after reading the actual article it screamed "Blog me!"
It could be argued that the main finding of the paper was not the reported use of mutliples and momentum investing, but that "...over two-thirds of the sample are passive investors, and not because they don’t have the time to invest."
Thus, the headline grabbing headlines were not from the entire sample but only a small subsample of active investors.
Which to my biased reading suggests that the majority of finance professors do appear to practice what they preach!
Finance Profs Reveal How They Invest Own Money (The Pro Shop) | SmartMoney.com:
"Colby Wright, assistant professor of finance at Central Michigan University and James Doran, finance professor at Florida State University, [survey] ... finance professors. After all, they're arguably the most educated and well-informed people when it comes to understanding the mysteries behind stock price movements. [I think the article somehow left out 'best looking", funniest, and "nicest" as well.] So Wright and Doran set out to survey all the professors of finance in the U.S. and ask what's most important to them when investing their own money. The survey resulted in 642 usable responses. They published their results earlier this year in a paper titled 'What Really Matters When Buying and Selling Stocks?"
The findings were not exactly what we would think. For instance the survey suggests that PE ratios, market multiples, and momentum investing are among the keys and not CAPM, efficient markets and the market risk factors.
"Out of 43 variables given, the most important were a company's price/earnings ratio and how close a stock is to its 52-week high to low. Considering the material most finance professors teach their students as a way of explaining stock price movements — like the capital asset pricing model and discounted cash flows — Wright calls the findings surprising"
Which is true to a degree, but virtually all finance classes also cover market multiples, such as PE ratios, in some format. For instance in my classes I harp on the fact that both Discounted CAsh Flow analysis and multiples are really doing something very similar just in a different way and there is a place for both. In fact, we generally say that the time to perform a DCF projection is often not worth it for small investments.
Had that been the entire story it MIGHT have been blog worthy. However, after reading the actual article it screamed "Blog me!"
It could be argued that the main finding of the paper was not the reported use of mutliples and momentum investing, but that "...over two-thirds of the sample are passive investors, and not because they don’t have the time to invest."
Thus, the headline grabbing headlines were not from the entire sample but only a small subsample of active investors.
Which to my biased reading suggests that the majority of finance professors do appear to practice what they preach!
Thursday, September 13, 2007
Hedge funds lure business school profs
Hedge funds lure business school profs:
"The growing and lightly regulated hedge fund industry is attracting new players -- business school professors eager to test their theories in a field known for big risks and occasionally bigger rewards. Hedge funds are becoming a tempting tool for faculty members looking to sharpen research and giving a Wall Street perspective to their students, all while making some extra money."
"The growing and lightly regulated hedge fund industry is attracting new players -- business school professors eager to test their theories in a field known for big risks and occasionally bigger rewards. Hedge funds are becoming a tempting tool for faculty members looking to sharpen research and giving a Wall Street perspective to their students, all while making some extra money."
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