Comments, observations and thoughts from two bloggers on applied statistics, higher education and epidemiology. Joseph is an associate professor. Mark is a professional statistician and former math teacher.
Friday, March 30, 2012
Canada (finally) removes the penny from circulation
Why can't we do the same here in the United States? Is there anybody left who sees a penny as a real unit of value and not a complication for transactions?
Thursday, March 29, 2012
More on seventeen thousand -- bounding the problem
The cost for such sinecures is particularly galling when it is passed on to the rest of the middle class and to taxpayers in states that are struggling to support higher education. Since faculty salaries make up the largest single cost in virtually all college and university budgets (39 percent at Montgomery College), think what it would mean if the public got full value for these dollars.(First a brief aside: in a service industry, I would normally expect that much, if not most, of operating costs would go to the salaries of the workers who provide that service. 39% is not outside of the reasonable range for this situation but it is low enough to make me wonder if cost cutters shouldn't be asking what happens to the 61% that doesn't go to teaching.)
...
If the higher education community were to adjust its schedules and semester structure so that teaching faculty clocked a 40-hour week (roughly 20 hours of class time and equal time spent on grading, preparation and related duties) for 11 months, the enhanced efficiency could be the equivalent of a dramatic budget increase. Many colleges would not need tuition raises or adjustments to public budget priorities in the near future. The vacancies created by attrition would be filled by the existing faculty’s expanded teaching loads — from 12 to 15 hours a week to 20, and from 30 weeks to 48; increasing teachers’ overall classroom impact by 113 percent to 167 percent.
And almost all schools (including Montgomery) have part time faculty or graduate TAs. Without mass firings, doubling the workload of full-time faculty would mainly result in reducing work for low-paid part timers (At Montgomery, the starting rate is less than $900 per semester hour). Now we're looking at less than a 10% reduction in costs.
This is not a serious proposal, it's just another example of someone trying to get some attention by taking a provocative position without doing the actual work needed to support it.
Free roads, health care and This American Life
Robert Smith -- It's no accident that Colorado Springs is the place where all this happened. Colorado Springs is not just conservative, it is famous for being conservative. It's the home of Focus on the Family, evangelical churches like the New Life Church, four military bases, Air Force Academy. It is in the most right-leaning congressional district in all of Colorado. Add to the mix outdoorsy types, mountain bikers, ex-hippies, and you get this kind of pioneer leave me alone vibe around here.The town responded first by making most city services ala carte (you want streetlights on your block? Send the city a check) and then by extensive privatisation, with somewhat mixed results:
The citizens of Colorado Springs didn't just believe in limited government, they made it law. 20 years ago they passed the Taxpayer Bill of Rights. TABOR, everyone calls it. And TABOR-- you may have heard of this because other states have put it on the ballot. But it started right here in Colorado Springs. Under TABOR, if you want to raise or impose any tax at all, you have to get the voters to approve it first.
Jan Martin -- Our voters very rarely will support a tax increase.
Robert Smith -- This is Colorado Springs City Councilwoman Jan Martin, one of the people who deals with TABOR day in and day out. TABOR is like a set of handcuffs for city government. It limits how much you can grow your budget, makes it hard to shift money from one thing to another. The city survives mostly on sales tax, which is great when the town is filled with tourists, right? All those hikers and mountain bikers buying energy bars.
But when a recession comes along, living off sales tax is a disaster.
Jan Martin -- What we experienced when the downturn occurred is, immediately, people stopped buying, which meant our dollars dropped faster than most communities. And we crashed and burned almost simultaneously with the economic downturn.
Robert Smith -- In 2009, tens of millions of dollars the city was counting on didn't materialize. Jan believed TABOR only gave her one choice. She had to ask voters for the tax increase you heard about. And this wasn't easy for Jan. She's a Republican. She owns her own business. She has an MBA in finance. But she thought, I just need to be straight with voters about the situation we're in.
She said, look., the city needs to raise $28 million. That means the average homeowner would have to kick in about $200 a year.
Jan Martin -- To go before the voters in the middle of an economic downturn, I will admit, it was pretty gutsy. But I really felt as an elected official I owed it to the general public to give them an option before the cuts were made.
Robert Smith -- It wasn't even close. The voters in Colorado Springs said no way. Nearly 2/3 of them voted against the tax.
Robert Smith -- Roland was doing more work for less money. That's the dream of privatization, right? But the bigger picture here is more complicated. Remember, Roland isn't the only cost involved. The private landscaping firms add a healthy profit on the top, that's normal. And they had to purchase a lot of the things that the city already had, like equipment.This points to a difficulty with this debate. The anti-tax, pro-privatisation movement revolves around language of government inefficiency and waste, terms that wouldn't be out of place at a meeting of financial analysts.
So did the city really save any money here by outsourcing, by privatizing Roland's job? We asked the city of Colorado Springs this question over and over again. And they hemmed and they delayed. They couldn't find a number. Then they said it's tough to calculate. In the end, all we could get from the city was this. Outsourcing Roland Hawkins and all those other workers might save money in the future.
Because medical costs will rise. Pension costs could also rise. Better to get Roland off the books now, privatize him now. But as for last summer, the first year of the parks experiment, the city couldn't say if they saved a dime.
Overall, the city's budget for parks is about $12 million now, a lot smaller than it was at its height. But that's mostly because the parks department is doing less. They've closed swimming pools and laid off community center employees. They're replacing fewer playgrounds and fences and bridges. And Roland, for his part? He's not going back to the parks this summer. He hurt his back.
What I learned, though, from talking to the people in Colorado Springs is that for a lot of them these calculations don't really matter. They don't care if privatizing actually saves the government money, so long as the government is doing less.
City councilwoman Jan Martin says she hears this all the time. That it's become a matter of faith in the city that private is better. And she tells us a story. In the dark days, after the tax measure was defeated, city council was having another meeting about slashing government.
Jan Martin -- And a gentleman came up to me and actually thanked me for the adopt a street light program. He had just written a check to the city for $300 to turn all the street lights back on in his neighborhood. And I did remind him that for $200 if he had supported the tax initiative, we could have had not only streetlights, but parks and firemen and swimming pools and community centers. That by combining our resources, we as a community can actually accomplish more than we as individuals.
Robert Smith -- And he said?
Jan Martin -- He said he would never support a tax increase.
Robert Smith -- So for him it wasn't the money. He was willing to pay more to turn on the street lights than to pay for all city services.
But a segment of the movement (and, I suspect a fairly large one) is represented by this man, someone who's aversion to taxes is so strong that he would rather pay half again as much and get far fewer services. This is not necessarily an irrational decision (he might have objected to people in other neighborhoods who paid less getting streetlights as well -- that's not a position I would take but it's a perfectly defensible one), but it's not a financial decision and discussing it in terms of waste and inefficiency won't accomplish much.
This would be a good time to bring Jonathan Chait's seminal essay exploring small government and privatisation as ends to themselves into the discussion, or it would be a good time if it were an earlier one.
I'm going to bed. Discuss it among yourselves.
Wednesday, March 28, 2012
Roads and Free markets
Assembling the land needed for a long-distance road is prohibitively expensive without government assistance. Unsurprisingly, private roads almost never come into existence without extensive government assistance. And that means that the profitability of a "private" road depends crucially on how many competing roads the government allows to exist.
It's unsurprising, then, that real-world privatization schemes are often explicitly protectionist. A 2004 GAO survey found that four of the five privately-funded toll road projects started or completed in the preceding 15 years included non-compete clauses that restricted the creation of competing freeways nearby. It's much easier to turn a profit when would-be competitors are barred from entering the market.
Supporters of free-market roads point to the experience of the United States and Great Britain in the 18th and 19th centuries as the golden age of private roads, but those roads were only private in a limited sense. This history is detailed in Street Smart, an edited collection published by the libertarian Independent Institute. Daniel Klein and John Majewski write that in the United States, "turnpikes were encouraged by government, sometimes by granting of exisitng trails or public roadbeds to turnpikes, sometimes guarantees against new parallel routes, and typically the granting of eminent domain powers." They write that they "cannot say" whether these privileges were important to the success of these turnpikes.
The basic pattern seems to have been the same for British toll roads. Most toll roads replaced previously-existing public roads; the book doesn't say if the new roads were built with eminent domain or other government privileges. Indeed, after thumbing through the entire 500-page book, I didn't find a single example of a country, now or in the past, where most roads were built using ordinary market transactions. The vast majority of "private" roads, around the world and throughout history, came into existence thanks to direct government assistance.I think that is is important to recognize that some areas of human activity are inevitably going to have at least some degree of government involvement. Roads are a classic public good -- without them we would be far less mobile and trade would be much more difficult. But a single actor can block the development of roads, absent a government intervention.
But the part that is the most interesting is how a public good can be turned into a vehicle for rent-seeking. As soon as there is a hint of a "non-compete" or "guarenteed revenue" clause in a privatization, you can be absolutely sure that there is not a functioning free market present. We do not grant non-compete clauses to restaurants or clothing stores. The ability of these business to fail is part of the entire point of the private sector (creative destruction).
Free markets in everything is now (and always will be) a myth, just like public markets in everything ended up as a terrible system. Why are we so resistent as a society to the incredible success of mixed markets?
Monday, March 26, 2012
Seventeen thousand and change
I really didn't mind the low salary. The work was enjoyable and I've always been good at living within my means. Besides, there were adjuncts who had it worse than me. Still, seventeen thousand and change is a good number to keep in mind when you read something like this (by David Levy via Krugman):
With the 1970s advent of collective bargaining in higher education, this began to change. The result has been more equitable circumstances for college faculty, who deserve salaries comparable to those of other educated professionals. Happily, senior faculty at most state universities and colleges now earn $80,000 to $150,000, roughly in line with the average incomes of others with advanced degrees.Seventeen thousand and change.
Not changed, however, are the accommodations designed to compensate for low pay in earlier times. Though faculty salaries now mirror those of most upper-middle-class Americans working 40 hours for 50 weeks, they continue to pay for teaching time of nine to 15 hours per week for 30 weeks, making possible a month-long winter break, a week off in the spring and a summer vacation from mid-May until September.
It is a deeply dishonest piece filled with statistical sleight-of-hand and numbers that don't add up. Robert Farley does a good (though hardly exhaustive) job of laying out the fallacies. I'm not sure I have much to add to it other than to recommend that as you're reading Levy's piece you stop from time to time and repeat to yourself,
"Seventeen thousand and change."
Sunday, March 25, 2012
Weekend gaming -- mutant sprouts
On the subject of topology, my game of choice is Sprouts, invented by mathematicians John Horton Conway and Michael S. Paterson at Cambridge University in 1967 (as a general rule, you can't go wrong with a game if Conway had anything to do with it).I was thinking about sprouts the other day and a few variations occurred to me. I don't know if they're particularly playable or if they add any interesting aspects to the game, but if you can't put a half-baked idea in a blog, what's a blog for?
The rules are simple:
1. Start with some dots on the paper. The more dots you have the longer the game takes so you will probably just want to start with two or three.
2. Players take turns either connecting two of the dots with lines or drawing a line that loops back and connects a dot with itself.
3. The lines can be straight or curved but they can’t cross themselves or any other lines.
4. Each dot can have at most three lines connecting it
5. When you draw a line put a new dot in the middle.
6. The first player who can’t draw a line loses.
Score = 6
Score = 7
Saturday, March 24, 2012
Mark and I both remarked on this post
A homeless girl turns out to be a science genius. I see stuff like this all the time. My brother-in-law grew up in a trailer with a teenage single mom, and he's now completing his PhD. My friend grew up poor in rural Northern California with a drug-abusing single mom, and now she's a neurosurgeon. There is so much human capital hidden in the poverty-stricken backwaters of America, it's absurd. And yet I still read pronouncement after smug pronouncement from guys like Bryan Caplan, declaring that success is all about I.Q., and that it's no use trying to increase economic opportunity because everyone is already just where their I.Q. dictates they should be. What a load of poppcock, rubbish, stuff & nonsense.The idea that social position is already perfectly distributed based on merit is reassuring for those in high socio-economic positions but seems dangerous. At some point I will give my Ayn Rand critique again (the places where Ms. Rand's philosophy is unable to cope with actual people).
But the world is filled with people who have been successful despite being poor or disadvantaged. That should be celebrated and not suppressed.
Friday, March 23, 2012
Consequences
But of course "the policy of economic austerity" is not a living breathing human being with feelings and interests and values. And the specific human beings who pushed austerity policies on Europe—central bank chief Jean-Claude Trichet and his successor, their colleagues on the ECB board, Angela Merkel and her coalition partners, etc.—have not been dealt personal blows here either. They're all fine. The blow has been dealt to unemployed Irish people who are hoping to get jobs soon. The blow has been dealt to Irish small business operators who have a decent underlying product and were hoping to expand production when customers would have a bit more cash in their pockets. The blow is dealt to Irish kids who are going to school with parental joblessness and economic distress hanging over their heads.I have been seeing the same line of thinking from Karl Smith over at Modeled Behavior and I think it is overdue in the public discourse. Policies often hurt individual people, and not usually those who are making these decisions. I actually don't see this as a failure of government so much as social cohesion and the idea that we all benefit from a strong and well functioning economy.
Policy is interesting in the abstract, but it is worth remembering that bad policy has consequences for specific people in the real world.
Thursday, March 22, 2012
More on the growth fetish -- Facebook vs. Groupon
Breakthrough technology startups are different from other kinds of businesses in that they either create a new market or violently disrupt an existing one. This means that they almost invariably require to spend lots of capital in order to stake out a defensible market position against their numerous competitors. In particular, many technology markets have winner-take-most or winner-take-all dynamics, either because of network effects or economies of scale…
Felix writes that Groupon had a profitable Q1 2010 and “it’s easy to see how it could have grown steadily from that point onward.” Except that given the characteristics of the daily deal business, particularly the need for scale, what would have happened if Groupon had tried to “grow steadily” and profitably, is that the company wouldn’t be around anymore.
It’s LivingSocial that would have raised over a billion dollars and be worth $10 billion today, Groupon would have been sold for scrap like BuyWithMe and plenty of other daily deals also-rans, and Andrew Mason would be back to doing yoga on YouTube. Groupon would be a footnote.
The first mover advantages for Groupon are far less obvious. There's no reason why we couldn't have two online gift card businesses. Consumers would get a wider selection and the merchants would almost certainly see lower fees (there's no way Groupon could charge those rates in a competitive market). Nor are the economies of scale that significant, at least not for the part of the business based on arranging deals with local merchants.
A potential competitor would have to spend a lot of money building a mailing list but probably not that much more than Groupon spent on its list. In short, if a potential competitor were to spend as much money as Groupon has, it might just catch up (particularly given the fact that Groupon is not a very well run company).
In terms of lifetime value, I suspect that the money Groupon spent on explosive growth was badly invested. However, in terms of buzz and stock price, it may have been money well spent as far as the backers were concerned.
Venture capital and the growth fetish
Another way to look at this question is to compare US fight-to-be-number-one capitalism with the kind of capitalism practiced in undeniably successful countries like Germany, Korea, Brazil, and Japan. Those countries don’t have nearly as many world-beating behemoths as the US does, but overall their economies and current accounts are doing very well on a bedrock of medium-sized firms and family-owned corporations.I think this fits nicely with one of our ongoing themes here at OE, the growth fetish:
So in a way, Gobry is making my point for me. The IPO market and the VCs who feed off it are playing a game which might make a small number of people extremely rich, and which will create a very small number of hugely successful world-beating companies. They’re not playing a game which is good for founders; they’re not playing a game which is good for healthy, long-lived companies; and they’re not playing a game which is good for the economy as a whole. That’s kind of the point I’m making in the piece when I say that “Silicon Valley is full of venture capitalists who have become dynastically wealthy off the backs of companies that no longer exist”.
Think of it this way, if we ignore all those questions about stakeholders and the larger impact of a company, you can boil the value of a business down to a single scalar: just take the profits over the lifetime of a company and apply an appropriate discount function (not trivial but certainly doable). The goal of a company's management is to maximize this number and the goal of the market is to assign a price to the company that accurately reflects that number.I didn't consider the role of venture capital at the time. Perhaps I missed the biggest factor.
The first part of the hypothesis is that there are different possible growth curves associated with a business and, ignoring the unlikely possibility of a tie, there is a particular curve that optimizes profits for a particular business. In other words, some companies are better off growing rapidly; some are better off with slow or deferred growth; some are better off simply staying at the same level; and some are better off being allowed to slowly contract.
It's not difficult to come up with examples of ill-conceived expansions. Growth almost always entails numerous risks for an established company. Costs increase and generally debt does as well. Scalability is usually a concern. And perhaps most importantly, growth usually entails moving into an area where you probably don't know what the hell you're doing. I recall Peter Lynch (certainly a fan of growth stocks) warning investors to put off buying into chains until the businesses had demonstrated the ability to set up successful operations in other cities.
But the idea of getting in on a fast-growing company is still tremendously attractive, appealing enough to unduly influence people's judgement (and no, I don't see any reason to mangle a sentence just to keep an infinitive in one piece). For reasons that merit a post of their own (GE will be mentioned), that natural bias toward growth companies has metastasised into a pervasive fetish.
This bias does more than inflate the prices of certain stocks; it pressures people running companies to make all sorts of bad decisions from moving into markets where you don't belong (Borders) to pumping up market share with unprofitable customers (Groupon) to overpaying for acquisitions (too many examples to mention).
Wednesday, March 21, 2012
Misleading chart of the day
Now examine Aaron Carroll's great rebuttal!
In general, I think Yglesias is correct that it is difficult to have any real reliability for 75 year cost projections (I wonder what the confidence limits are?). So much is likely to change over this period of time and the prioirites of the nation may be so different that it is completely unclear how helpful such an exercise will be. Not only do we have issues with technological and political change, but it would be odd if no future government altered policy priorities or if we could accurately guess economic growth over such a period.
Freakonomics
One piece that I do think is worth reflecting on is this one:
Their first example of a “mistake” concerns a May, 2005, Slate column we wrote about the economist Emily Oster’s research on the “missing women” phenomenon in Asia. Her paper, “Hepatitis B and the Case of the Missing Women,” was about to be published in the Aug. 2005 issue of the Journal of Political Economy. At the time, Levitt was the editor of JPE, and Oster’s paper had been favorably peer-reviewed.
Oster argued that women with Hepatitis B tend to give birth to many more boys than girls; therefore, a significant number of the approximately 100 million missing females might have been lost due to this virus rather than the previously argued explanations that included female infanticide and sex-selective mistreatment.
Other scholars, however, countered that Oster’s conclusion was faulty. Indeed, it turned out they were right, and she was wrong. Oster did what an academic (or anyone) should do when presented with a possible error: she investigated, considered the new evidence, and corrected her earlier argument. Her follow-up paper was called “Hepatitis B Does Not Explain Male-Biased Sex Ratios in China.”I think that this missed the point of what was causing concern with this article. An economist wanders into public health and overturns the conventional wisdom completely by considering a possible predictor but not really understanding why epidemiologists had not considered a disease-based explanation before. It should not be considered a small point that the article showed up in an economics journal and not in a journal where it would be reviewed by experts in the clinical area.
Is this necessary wrong to have reported potentially exciting new results? No. It is also true that people did put the effort into reporting when the understanding changed. But this was in a well developed area of public health with very high policy stakes and people willing to put in a lot of effort to understand if there could be an alternate explanation. So it induces some skepticism about "counter-intuitive" claims in areas where there are not the resources to scrutinize these claims deeply.
Now it is natural that research has an error rate. I wish it did not (especially not my research). But it does point out the hazards of popularizing prelimary results. I think I am especially sensitive to this issue as no field is more guilty of alarming and counter-intuitive findings than pharmacoepidemiology. So I look for clues that make me cautious about publicizing preliminary results before they are really ready for prime time.
Tuesday, March 20, 2012
The Mike Daisey incident illustrates the best in modern journalism
We have always had and will always have people like Mike Daisey, serial fabulists with a gift for self-promotion. We will also always have journalistic sluggards who don't bother to check their facts and derivative hacks who pass on the conventional wisdom without scrutiny or independent thought.
The question is what do we do about these people, and the answer recently has generally been little or nothing. By comparison, the response to the Daisey incident was strong and apt and it gives us a simple template that, if followed, could go a long way toward fixing American journalism.
This is the rule: when you screw up, you take responsibility, try to set the story straight and (here is the essential part) you make your retraction at least as long and at least as prominent as the story you're apologising for.
These days, journalistic malpractice (when not ignored altogether) is generally punished by inclusion in a box that almost no one ever reads on the second page of a newspaper (and even that mild of a penalty is enough to generate whining and self-pity from journalists like David Carr*).
Just imagine what things would be like if errors in front page stories were always followed by front page corrections.
* From Fresh Air
"After I started [at the Times], I quickly ended up on page two ... the Corrections. They're not buried to us; that is a hall of shame ... it's a page you want to totally stay off of ... It doesn't matter where the error occurs — it always follows you around.
"Part of the deal of working at The New York Times is that your readers, a portion of whom are church ladies and copy ninnies and fact freaks, they wait like crows on a wire for you to make the slightest error and then descend, caw, caw, caw-ing, every time you screw up. It still is something that wakes me up at night."
Monday, March 19, 2012
21st century Journalism
This is not consistent with anyone being able to walk up to Foxconn and within two hours be talking to underage workers. The story Daisey tells is one where Apple is negligent to an obvious and easily solved problem, whereas the facts TAL reports are of a company trying to stop underage workers and failing on relatively rare occasions. This kind of lie is not telling the story of the truth through a fictional narrative, but creating a fictional narrative that contradicts the bigger truth.Felix Salmon also has some tough commentary on this issue. The key point here seems to be that it makes a great deal of difference what the facts are. Outright falsehoods are an issue and it is terrifying that such obvious lies passed the fact checkers or that people feel like a defense can be mounted for this behavior as being in "in the greater good" (that the fictional narrative might be exposing hidden truths that are hard to show facts on).
We should do better.
Census documenting Great Depression to be released
NEW YORK (AP) — It was a decade when tens of millions of people in the U.S. experienced mass unemployment and social upheaval as the nation clawed its way out of the Great Depression and rumblings of global war were heard from abroad.Now, intimate details of 132 million people who lived through the 1930s will be disclosed as the U.S. government releases the 1940 census on April 2 to the public for the first time after 72 years of privacy protection lapses.