By James Kwak
To make a vast generalization, we live in a society where quantitative data are becoming more and more important. Some of this is because of the vast increase in the availability of data, which is itself largely due to computers. Some is because of the vast increase in the capacity to process data, which is also largely due to computers. Think about Hans Rosling’s TED Talks, or the rise of sabermetrics (the “Moneyball” phenomenon) not only in baseball but in many other sports, or the importance of standardized testing scores in K-12 education, or Karl Rove’s usage of data mining to identify likely supporters, or the FiveThirtyEight revolution in electoral forecasting, or the quantification of the financial markets, or zillions of other examples. I believe one of my professors has written a book about this phenomenon.
But this comes with a problem. The problem is that we do not currently collect and scrub good enough data to support this recent fascination with numbers, and on top of that our brains are not wired to understand data. And if you have a lot riding on bad data that is poorly understood, then people will distort the data or find other ways to game the system to their advantage.
Readers of this blog will all be familiar with the phenomenon of rating subprime mortgage-backed securities and their structured offspring using data exclusively from a period of rising house prices — because those were the only data that were available. But the same issue crops up in many different stories covering different aspects of society.


Health-Care Costs and Climate Change
By James Kwak
That’s the average global temperature from 1998 through 2008, according to NASA. This, of course, is what enabled George Will to write, in 2009, “according to the U.N. World Meteorological Organization, there has been no recorded global warming for more than a decade.”
Of course, George Will is just a run-of-the-mill climate change denier with a gift for mis-using statistics. In this case, he was probably citing a World Meteorological Organization study that said, “The long-term upward trend of global warming, mostly driven by greenhouse gas emissions, is continuing. . . . The decade from 1998 to 2007 has been the warmest on record.” And here’s the long-term picture, also from NASA:
You all know this, so why am I bringing it up?
Well, look at this, from J. D. Kleinke of AEI in The Wall Street Journal:
Those are annual percentage changes in nominal terms, so his point is that annual increases are going down. But what does the long term look like?
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Posted in Commentary
Tagged climate change, health care, national debt