Following Mark's link on education

As a follow-up to Mark I wanted to specically call out some of the pieces of Felix Salmon's piece on test scores and education. 

Instead, reformers are rushing to use this data as a quantitative performance-review tool, something which can get you a raise or which can even get you fired. And by so doing, they’re turning it from something potentially extremely useful, into a bone of contention between teachers and managers, and a metric to be gamed and maximized.
 

When all decisions on based on a single score, you incent behavior which maximizes the score and minimize additional focus.  Felix makes an interesting point that if you used this data to provide coaching and feedback then it could actually be really useful.  Teachers would still want students to do well on the test (it is much, much nicer to talk to your principal about how generally well your students are doing than to get coaching on how to try and shore up a weak point). 

I also think that this point was really sharp:

School reformers in general, it seems to me, tend to be obsessed with the idea of Good Teachers and Bad Teachers, as though the quality of the education a kid gets in any given classroom is somehow both predictable and innate to the teacher. And yes, at the extremes, there are a few great inspirational teachers who we all remember decades later, and a few dreadful ones who had no idea what they were talking about and who had no control of their classes. But frankly, you don’t need student surveys to identify those outliers. And the fact is that schools are much more than just the sum of their parts: that’s one of the reasons that reformers love to talk about excellent principals who can turn schools around.

He is very cleverly and accurately pointing out a form of equivocation that is being used here.  There are extreme examples, but they were never the problem in terms of identification.  There are some odd employment rules in some places that made acting on this knowledge awkward, but very few people saw these as being good policy.  The real use of these tests to to try and break apart the middle of the distribution.  But, by definition, the gain in the middle of the distribution is much less than the difference between exceptional and abysmal.  You are not taking Jaime Escalante versus an incompetent as your contrast.  You are taking pretty good versus very good as your contrast, and thus setting things up for a life event to move people back and forth in the distribution.  Your child gets ill, you are more tired and work so you lsoe your job because you slip below the median.  No wonder teachers are suspicious of such metrics. 

Data is good but one of the lessons of the MBA approach to management is that not everything can be broken down into numbers on a spreadsheet to be maximized.  I fear we'll figure that out, sooner or later. 

Essential Felix

It's a busy week so I don't have the time to give this the build-up it deserves, but if you've been following the education reform debate, you need to read this.

The main reason epidemiology is hard... urgency

There's a point I should have emphasized in my previous post about this news story

Researchers have long documented that the most educated Americans were making the biggest gains in life expectancy, but now they say mortality data show that life spans for some of the least educated Americans are actually contracting. Four studies in recent years identified modest declines, but a new one that looks separately at Americans lacking a high school diploma found disturbingly sharp drops in life expectancy for whites in this group. Experts not involved in the new research said its findings were persuasive.

I commented that cohort effects could complicate things in a study like this. What I should have made clear was that, even with these complications:

1.  These numbers are horrifying;

2. Even if the effects are less dramatic than what the most recent study indicated, there is considerable evidence that life expectancies are getting worse for the most disadvantaged people in our country.

I'm primarily a marketing statistician. I hardly ever make life and death decisions. Epidemiologists play for higher stakes. I believe it's healthy for outside statisticians like me to point out concerns with epidemiological research, but we need to remember that researchers inside the field don't have the option of waiting for a perfect data set. Their findings have a huge impact on the health of millions of people and those millions can't wait for perfect.

More on the whole "Epidemiology is Hard" thing

There's a new study that's been getting a lot of press:

For generations of Americans, it was a given that children would live longer than their parents. But there is now mounting evidence that this enduring trend has reversed itself for the country’s least-educated whites, an increasingly troubled group whose life expectancy has fallen by four years since 1990.
Researchers have long documented that the most educated Americans were making the biggest gains in life expectancy, but now they say mortality data show that life spans for some of the least educated Americans are actually contracting. Four studies in recent years identified modest declines, but a new one that looks separately at Americans lacking a high school diploma found disturbingly sharp drops in life expectancy for whites in this group. Experts not involved in the new research said its findings were persuasive.

The reasons for the decline remain unclear, but researchers offered possible explanations, including a spike in prescription drug overdoses among young whites, higher rates of smoking among less educated white women, rising obesity, and a steady increase in the number of the least educated Americans who lack health insurance.

The steepest declines were for white women without a high school diploma, who lost five years of life between 1990 and 2008, said S. Jay Olshansky, a public health professor at the University of Illinois at Chicago and the lead investigator on the study, published last month in Health Affairs. By 2008, life expectancy for black women without a high school diploma had surpassed that of white women of the same education level, the study found.

White men lacking a high school diploma lost three years of life. Life expectancy for both blacks and Hispanics of the same education level rose, the data showed. But blacks over all do not live as long as whites, while Hispanics live longer than both whites and blacks. The decline among the least educated non-Hispanic whites, who make up a shrinking share of the population, widened an already troubling gap. The latest estimate shows life expectancy for white women without a high school diploma was 73.5 years, compared with 83.9 years for white women with a college degree or more. For white men, the gap was even bigger: 67.5 years for the least educated white men compared with 80.4 for those with a college degree or better.
...
The decline among the least educated non-Hispanic whites, who make up a shrinking share of the population, widened an already troubling gap. The latest estimate shows life expectancy for white women without a high school diploma was 73.5 years, compared with 83.9 years for white women with a college degree or more. For white men, the gap was even bigger: 67.5 years for the least educated white men compared with 80.4 for those with a college degree or better.

This is, unquestionably, a troubling finding and I have every reason to believe that the researchers did a responsible job. None the less, this part still troubles me:

Researchers said they were baffled by the magnitude of the drop. Some cautioned that the results could be overstated because Americans without a high school diploma — about 12 percent of the population, down from about 22 percent in 1990, according to the Census Bureau — were a shrinking group that was now more likely to be disadvantaged in ways besides education, compared with past generations.

Professor Olshansky agreed that the group was now smaller, but said the magnitude of the drop in life expectancy was still a measure of deterioration. “The good news is that there are fewer people in this group,” he said. “The bad news is that those who are in it are dying more quickly.”

Dying at the age of seventy in 1990 would mean you were born in 1920. Dying at the age of sixty-seven in 2008 would mean you were born in 1941. If you were to build a model to predict whether someone born in in 1920 would finish high school, it would certainly look different than a model predicting the same thing for someone born in 1941. We know this, for one reason, because the target variable was much less frequent for the second group.

Of course, we're talking about averages and distributions and that can complicate things in a number of ways (most of which don't make it into a newspaper account of a research paper), but no matter how you slice it, what it meant to have a high school diploma changed greatly from the early to the middle part of the Twentieth Century, and that change is very difficult to control for.

I think it's generally a good, conservative rule to assume that when the relative size of a segment of the population drops dramatically, the composition of the segment is likely to shift. Thus a sharp increase in a behavior in these groups' behavior may simply be a result of the people who didn't show the behavior not being in the group any longer.

I'm not saying that this is the case here. I'm just saying that this sort of analysis makes me  nervous.

(I have the same problem with dropping poll responses, but more on that later

This does not seem to be a hoax

From Marketplace:

But the course of true investing never did run smooth, and there are some traders who look to the stars to tell them what to do. Financial astrologers like Karen Starich say traders know they're up against a lot of rich, smart people.

"They want to have that edge," she says. "They want to know what the future is."

Starich chargest $237 annually for her newsletter, which 300 traders subscribe to for news of what will happen to the stock prices of companies, or even bigger, to the Federal Reserve. She sees dark times ahead in the Fed's horoscope.

"They now have Saturn squared to Neptune, which is really bankruptcy," Starich explains.

Neptune represents money. But when Saturn shows up in a chart, it indicates restriction. So for the Fed, that means the "fiscal cliff is here, and there’s no place to go except to print more money or unravel these financial institutions," Starich says.

Of course, a lot of Wall Street traders, and others, don't want it to be known that they're relying on anything other than their own talent. Arch Crawford, a financial astrologer who actually got his start on Wall Street as a stock analyst at Merrill Lynch, recalls one subscriber asking for his newsletter in "brown paper wrappers."

Crawford warns his 2,000 subscribers particularly against the dangers of Mercury in retrograde, a time when the planet appears to be going in reverse across the sky. The phenomenon, which happens three times or more a year, indicates a month when communications will be screwed up. He warns his subscribers never to start anything new during that time. He points to the fact that Knight Capital launched a new software program in August, when Mercury was in retrograde, and the brokerage firm nearly went out of business. He also notes that most major market glitches have happened while Mercury was in retrograde.

LA billboards -- another n = 1 hypothesis

I have absolutely nothing more than vague impressions to back this up but it seems that a disproportionate share of the billboards of in this town, particularly around Burbank and Hollywood, are dedicated to TV shows. Of course, LA is a trend setter and a lot of media writers are based here, but billboards seem an inefficient way of targeting a relatively few influential players.

I suspect that (if I'm right about the over-representation) there's a bigger factor that has nothing to do with maximizing corporate profits. Instead the objective is to maximize the profile and reputation of the executives running the networks. The target audience is colleagues and acquaintances and the purpose is to create the impression that the executives are successful and influential.

William Goldman once observed that studio executives would rather make big budget films even when low budget alternatives made more business sense because, even if the big films lost money, they still gave you something to talk about at parties. ("I just greenlit the new Hanks/Roberts project. How about you?") After reading that, a number of why-did-they-make-that pictures were suddenly more explicable.

Lots of business decisions make more sense when you apply this cocktail-party standard (including the majority of sports sponsorships), but I wonder if anyone has seriously tried to study and quantify the extent to which home industries of a region are over-represented in local advertising. If not and if anyone's interested, I might have some design and metric ideas.

Back on the down ticket question

As mentioned before, one of the most interesting aspects of this election is the way the different races interact.

Thomas Ferraro has a good report on the topic:

It is axiomatic that a strong presidential nominee can boost the chances for other party candidates, particularly those in close U.S. Senate races.

But the presidential candidate can also hurt those farther down the ticket.

While a single comment might not alter particular races, a lagging campaign could. Republican Representative Steven LaTourette of Ohio, who is retiring from Congress, defended Romney's remarks, but said they "don't help in swing districts like mine." "People were ready to throw Obama over, like dumping a boyfriend, and were ready to be courted by a new boyfriend," he said. "But now they're having second thoughts," LaTourette said.

Republican Representative Tom Cole of Oklahoma called Romney's remarks "an unfortunate choice of words," but predicted the comments would be "a one- or two-day story."

"The election is going to turn on the economy," Cole said. University of Virginia political scientist Larry Sabato, whose "Crystal Ball" blog closely tracks congressional races, said Romney's performance would be particularly influential in Senate races in Virginia, Connecticut, Montana, North Dakota and Florida.

"Scott Brown can't survive much more undertow in Massachusetts," he said. George Allen, the Republican Senate contender in Virginia, "depends on a Romney win," Sabato added.

"As I go through the states, I'd say Romney's performance will help to determine most of the close Senate contests," he said in an email interview.

"It's going to be very difficult for Republicans to take over the Senate if Romney doesn't capture the White House. That's a different evaluation than a year ago when the GOP looked to be a good bet to grab the Senate."

Why is investment in human capital out of favor?

David Brooks:

The final thing the comment suggests is that Romney knows nothing about ambition and motivation. The formula he sketches is this: People who are forced to make it on their own have drive. People who receive benefits have dependency.

But, of course, no middle-class parent acts as if this is true. Middle-class parents don’t deprive their children of benefits so they can learn to struggle on their own. They shower benefits on their children to give them more opportunities — so they can play travel sports, go on foreign trips and develop more skills.

People are motivated when they feel competent. They are motivated when they have more opportunities. Ambition is fired by possibility, not by deprivation, as a tour through the world’s poorest regions makes clear.

 

I got this quote via Aaron Carroll.  One thing that seems to have really changed in the public mind over the past 5 years is the simple relationship between investment in human capital and improved outcomes.  Putting aside the Randian fantasy of super-men who can do it all on their own, all of us are dependent on others to a greater or lesser extent.  Hard work may well make opportunity into success but all of the hard work in the world doesn't help in the absence of opportunity.  Just ask any coal miner or subsistence farmer . . . 

Another recommend (this time not blind)

Dana Goldstein has some smart observations on Chicago and the teacher testing debate.

Another reason observational epidemiology is hard

John D Cook:

And yet behind every complex set of rules is a paper showing that it outperforms simple rules, under conditions of its author’s choosing. That is, the person proposing the complex model picks the scenarios for comparison. Unfortunately, the world throws at us scenarios not of our choosing. Simpler methods may perform better when model assumptions are violated. And model assumptions are always violated, at least to some extent.
 

 One of the hardest things with simulation studies is that we get to develop our own set of assumptions.  So we actually know how to correctly model the phenomenon of interest. 

The problem is that we usually do not know how much error is introduced when the complex (and often non-linear) model fails.  On the other hand, it is amazing how far one can get with a clear set of rules of the thumb. 

I wonder if it would be better if we had a different person test the model than the one who proposed it? 

Important if true

In the Nineteenth Century, news stories sometimes carried the disclaimer "Important if true." It was used for news that couldn't be confirmed but was too big to leave unreported. That line always struck me as a perfect representation of one of the three fundamental tensions of journalism, the one between getting it right and getting it first (the other two are between these goals and making the story interesting).

In a follow-up to a discussion about the way the press corp handled the 2000 election, I claimed that the culture of journalism was placing increasingly less value on accuracy. To support the accusation, I listed some examples from recent discussions, but there is a more direct and damning way to make the point.

Viewed in absolute terms the level of accuracy in current journalism is certainly not what it could be and is arguably in decline, but what about relative to cost? One hundred years ago, the time required to check a story was substantial. Sources were difficult to contact, reference materials had to be accessed in person and were often unindexed, and there was simply less recorded information. This time requirement translated to both labor and opportunity costs.

Over the years (particularly the last twenty), these costs have dropped sharply. The time required to get a story right has decreased by at least a couple of orders of magnitude. If we hold the value of accuracy constant, we would expect to see factual errors all but disappear. Instead we're seeing something between "as bad as ever" and "even worse." That means the value journalism as an industry puts on accuracy must have dropped as or more sharply than the costs of fact-checking did.

Think of it as Moore's law of diminishing journalistic quality.

Blind recommendation

I haven't got a chance to listen to more than the first couple of minutes, but I'm still prepared to recommend This American Life's latest episode, Back to School. That's not to say I expect to agree with everything I hear, just that I expect to leave better informed than I came in.

A culture of bad journalism

Eight years ago, in the bastions of the "liberal media" that were supposed to love Gore—The New York Times, The Washington Post, The Boston Globe, CNN—he was variously described as "repellent," "delusional," a vote-rigger, a man who "lies like a rug," "Pinocchio." Eric Pooley, who covered him for Time magazine, says, "He brought out the creative-writing student in so many reporters.… Everybody kind of let loose on the guy."

Evgenia Peretz

A bit more on Gore and the press. In the last post discussed the press's treatment of Gore, the way various forces caused many (if not most) of the country's most respected and best paid journalists to converge on a set of highly biased and unprofessional actions. I still think that's a good way to approach the story (and I wish someone who actually knew something about social psych would pick this up and run with it), but there were at least a couple of other factors that acerbated the situation.

On Hardball, Chris Matthews stated: "Al Gore, he's the one who said he created the Internet. He's the one who put out the word that he was the subject or the role model for Love Story, that he pointed the country's attention to Love Canal. He stuck himself into that story." Matthews concluded: "Gore got himself in those problem areas by vanity and showing off and trying to make himself cool."

from Media Matters 2007

These three points were probably the most frequently cited examples of Gore's flawed character. They were also all false. Moreover, they had been debunked almost immediately. And yet they proved impervious to repeated attempts at correction.

The problem was partly that many of the journalists wanted to believe the story, but there was also a larger shift in the culture of journalism away from factual accuracy. This shift has continued and, if anything, gotten worse. My favorite recent example is the spendthrift Spaniards.

From an earlier post:

In yesterday's NYT, Rachel Donadio had a report on Italy that included this sentence:

Germany has adamantly opposed what it sees as rewarding the bad behavior of southern rim countries like Italy, Greece, Spain and Portugal, which amassed high public debts and where tax evasion is rampant.

Except, of course, they didn't. Dean Baker (who first caught this) debunks:

Actually, of this group only Greece was consistently experiencing a rise in its debt to GDP ratio. In Portugal there was some increase in the debt to GDP ratio in the years prior to the recession, but Italy's debt to GDP ratio actually had been trending downward since 2000. Spain was running budget surpluses and had a considerably lower debt to GDP ratio than Germany.

It's not just that the NYT didn't bother to check these facts; it's that they had been debunked repeatedly in numerous places including this column printed less than a month ago in, you guessed it, the New York Times.

For various reasons, accuracy is simply not a priority.

Now add in the embrace of memes and collective narrative. Narratives are useful for organizing ideas but they're dangerous as well. As Steven Kloves put it in Wonder Boys, narratives are about what you leave out, in other words, they are built on confirmation bias. By accepting the idea that the press can and should converge on a collective narrative, we are giving journalists permission to leave out important fact. We're also making it easier for interested parties to manipulate the news.

Put these three together, an easily manipulated press corps, a disinterest in factual accuracy and an acceptance of convergent and bad journalism becomes almost inevitable.

(Just to be clear, I'm not saying there aren't any good journalists out there; I'm saying that they're good despite the culture of their profession.)

Andrew Gelman forces me to read Bob Somerby

"Gore elicited in us the childish urge to poke a stick in the eye of the smarty-pants"

Margaret Carlson

I was going to write a reply to Andrew Gelman's recent criticism of Paul Krugman but since everybody beat me to it, I'll limit myself to this post script

P.P.P.S. Maybe the zillion commenters who disagree with me here have a point! I still find it a bit of a stretch for people to claim that reporters’ personal likes/dislikes would have more of an effect on coverage than reporters’ ideologies and partisanship, but I can see the reasoning, which I think roughly goes like this: journalists are trained to not let their partisanship get in the way of their reporting, but they don’t have that same constraint with respect to personal like/dislike. Thus a liberal Democratic reporter who personally liked Bush and disliked Gore might slant the news toward Bush and even feel good about such a slant in that it represents a bending-over-backwards to not simply follow the partisan cue.

As noted, I remain skeptical of this story—-I’d think that, when it comes to a national election, partisanship would trump personality—-but it is a coherent argument, supported by data. Which satisfies the request, posed at the top of this post: “I’d like to see Paul Krugman’s evidence for this.”

There are some potentially interesting side questions here about the cultural differences between the sides of the spectrum ( "I am not a member of an organized political party. I am a Democrat."), but time is limited so I'll jump straight to the Cialdini.

If you'll flip to the liking, reciprocation, consistency, and social proof chapters of Influence, you'll find lots of evidence to support this story, much of it from peer reviewed papers. Here are some of the relevant points.

Many people have noted Bush was capable of considerable charm.

Many influential reporters had a long standing and well documented dislike of Gore.

The Washington press corp is small and cliquish, prone to convergent behavior.

Because of the image of a liberal bias and because the GOP is known for pushing back, there are generally fewer consequences for a story that puts a Democrat in a bad light. Admitting you've backed down tends to cause cognitive dissonance which is resolved by convincing yourself you meant what you wrote.

The written word is particularly noted for affecting attitudes. People who put beliefs in writing are much more likely to embrace those beliefs.

Bush literally wined and dined the press corp. (Google "lobster ravioli" and Bush). This kind of gift is big enough to make an impression but not large enough that the reporters could justify a lapse in ethics (if I give you a million dollars to do something bad, it is easier to justify and creates less dissonance). Once again we get reciprocation, cognitive dissonance, modification of attitude.

Finally, we know that people tend to greatly underestimate how easily they can be influenced by any one of these things, but it's when they start reinforcing each other that you can get people to do truly startling things.

So, we have a scenario right out of a social psych book, fairly well documented examples of biased coverage, and an election so close that a major change in the tone of coverage could very probably have changed the result.

I think this one goes to Krugman.

Education: Chicago edition

The teacher work action in Chicago is bringing up some strong feelings across many different bloggers.  I think there is a lot to say about this issue (in general) but I want to focus on one angle for the moment.  Here is a comment from Matt Yglesias:

If CTU members get what they want, that's not coming out of the pocket of "the bosses" it's coming out of the pocket of the people who work at charter schools or the people who pay taxes in Chicago.
 

Now, to be fair, Matt has some follow up posts that reflect a more nuanced view of this dispute.  But this point was seized on by Eric Loomis:

It’s these experiences that make me absolutely furious when Dylan Matthews and Matt Yglesias and Jacob Weisberg and other so-called liberals attack Chicago teachers by openly rooting from Rahm Emanuel to crush them or undermine them by warning readers about the effect of paying teachers on taxpayers. I don’t really know any of them personally. But I doubt any of them went to a public school, nor has much of the liberal punditry. And if they have, it’s almost certainly not one serving working-class communities like areas of Chicago or even Springfield. They can sit in their nice New York or Washington offices and attend retreats in baronial mansions like Slate held earlier this week and fret about the taxpayers and shame the teachers into thinking about the children all they want. They would never send their own children to the schools about which they pontificate. They have no idea what they are talking about.
 

No I don't want to discuss whether teacher pay in Chicago is sensible or not (Matt Yglesias defends the current levels here).  What I find a lot more interesting is the whole question of mixed system (with public and private options co-existing).  As a younger person, I often asked the question of why Canada generally made private medical services illegal (they have definitely relaxed the rules since then).  After all, why should be ban a person who wants to spend money on non-evidence based procedure or get faster service from spending cash to do so?  We do not ban pet rocks or other products of limited use. 

The answer was always that if there was a parallel "pay system" then the elite would attack the public option (as they would use the higher end options almost exclusively).  The net result would not just be a two tier system, but a two tier system that was actually worse than a designed one (as the lower tier would be formed by a series of constant cuts and the result would be worse than a planned low service level).  At the time, I did not see this as a likely outcome. 

But linking Chicago teacher pay increases to less resources for charter schools (even implicitly) makes this a much more credible concern.