Tag Archives: Statistics & Econometrics

Interpreting confounder and modifier coefficients The problem with a table presenting multiple estimated effect measures from the same model (“Table 2”) is that it encourages the reader to interpret all these estimates in the same way, typically as total-effect estimates. As illustrated above, the interpretation of a confounder effect estimate may be different than for the exposure effect estimate. Of course, it is possible that some secondary reported...

On gender and alcohol Breaking news! Using advanced multiple nonlinear regression models similar to those in recent news stories on alcohol and dairy and more than 3.6M observations from 1997 through 2012, I have found that drinking more causes people to turn into men! Across people drinking 0-7 drinks per day, each drink per day causes the drinker’s probability of being a man to increase by 10.02 percentage points (z=302.2, p<0.0001). Need I say,...

Causal inferences — what Big Data cannot give us .[embedded content] The central problem with the present ‘Machine Learning’ and ‘Big Data’ hype is that so many — falsely — think that they can get away with analyzing real-world phenomena without any (commitment to) theory. But — data never speaks for itself.  Data by themselves are useless. Without a prior statistical set-up, there actually are no data at all to process. Clever data-mining tricks are not...

The 25 Best Econometrics Blogs Yours truly, of course, feels truly honored to find himself on the list of the world’s 25 best econometrics blogs. 1. Bruno Rodrigues 7. Eran Raviv Blog Statistics and Econometrics 9. How the (Econometric) Sausage is Made 14. Lars P Syll Pålsson Syll received a Ph.D. in economic history in 1991 and a Ph.D. in economics in 1997, both at Lund University. He became an associate professor in economic history in 1995 and has since...

Debating econometrics and its shortcomings yours truly often gets the response from econometricians that “ok, maybe econometrics isn’t perfect, but you have to admit that it is a great technique for empirical testing of economic hypotheses.” But is econometrics — really — such a great testing instrument? Econometrics is supposed to be able to test economic theories. But to serve as a testing device you have to make many assumptions, many of which themselves cannot be tested or...

What has always bothered me about the “experimentalist” school is the false sense of certainty it conveys. The basic idea is that if we have a “really good instrument” we can come up with “convincing” estimates of “causal effects” that are not “too sensitive to assumptions.” Elsewhere I have written  an extensive critique of this experimentalist perspective, arguing it presents a false panacea, andthat allstatistical inference relies on some untestable assumptions … Consider...

In my library, there are n philosophy books and six economics books. If yours truly can choose two books of each type in 150 ways, how many philosophy books are there in my library?

Do complex numbers exist? (wonkish) .[embedded content]

Yours truly has invited five of his colleagues to share a Christmas lunch with him around the circular dinner table in his kitchen. Unfortunately, two of the colleagues are not on speaking terms with each other, so they cannot be seated together. In how many ways can we be seated around the table?

An easy one this week: Yours truly wants to distribute 30 one-dollar coins among his kids Linnea, David, and Tora. In how many ways can this be done if he wants all of them to get at least one coin?