Deep Inside the LSE

September 23, 2013
By

Mary Morgan, Professor of History and Philosophy of Economics at LSE (Department of Economic History) is giving a talk at Penn today, in our Department of History and Sociology of Science. She's done interesting work in the history of econometrics...

Read more »

Detecting Weak Instruments in R

September 23, 2013
By
Detecting Weak Instruments in R

Any instrumental variables (IV) estimator relies on two key assumptions in order to identify causal effects: That the excluded instrument or instruments only effect the dependent variable through their effect on the endogenous explanatory variable or variables (the exclusion restriction), That the correlation between the excluded instruments and the endogenous explanatory variables is strong enough […]

Read more »

Detecting Weak Instruments in R

September 23, 2013
By
Detecting Weak Instruments in R

Any instrumental variables (IV) estimator relies on two key assumptions in order to identify causal effects: That the excluded instrument or instruments only effect the dependent variable through their effect on the endogenous explanatory variable or variables (the exclusion restriction), That the correlation between the excluded instruments and the endogenous explanatory variables is strong enough […]

Read more »

More on Bayesian methods and multilevel modeling

September 23, 2013
By

Ban Chuan Cheah writes: In a previous post, http://andrewgelman.com/2013/07/30/the-roy-causal-model/ you pointed to a paper on Bayesian methods by Heckman. At around the same time I came across another one of his papers, “The Effects of Cognitive and Noncognitive Abilities on Labor Market Outcomes and Social Behavior (2006)” (http://www.nber.org/papers/w12006 or published version http://www.jstor.org/stable/10.1086/504455). In this paper […]The post More on Bayesian methods and multilevel modeling appeared first on Statistical Modeling, Causal…

Read more »

Generate permutations in SAS

September 23, 2013
By
Generate permutations in SAS

I've written several articles that show how to generate permutations in SAS. In the SAS DATA step, you can use the ALLPEM subroutine to generate all permutations of a DATA step array that contain a small number (18 or fewer) elements. In addition, the PLAN procedure enables you to generate [...]

Read more »

Going to Plot Some Proportions? Why not Flog ‘em First?

September 23, 2013
By
Going to Plot Some Proportions? Why not Flog ‘em First?

Fractions and proportions can be difficult to plot nicely for a number of reasons: If the proportions are based on small counts (e.g., two of his three computing devices were Apple products) then the calculated proportions will only take on a numbe...

Read more »

Waiting in One Line or Multiple Lines

September 23, 2013
By
Waiting in One Line or Multiple Lines

Whenever I go to the grocery store it always seems to be a lesson in statistics. I go get the things I need to buy and then  I try to select the checkout register that will decrease the amount of time I have to wait. Inevitably, I select the one line where there is some […]

Read more »

De la significativité (statistique)

September 23, 2013
By
De la significativité (statistique)

On va encore dire que je fais mon numéro d’anti-journaliste primaire, mais je voulais revenir sur une histoire, relayée par certains journaux (français) qui me laisse songeur sur les liens entre les journalistes et le milieu scientifique. Je ne reviendrais pas sur l’information que j’avais relayée alors (que @Tournyol a reprise sur Twitter ce week-end, et qui a beaucoup circulé ces dernières heures sur Twitter) où plusieurs journalistes traduisaient “augmenté de…

Read more »

Exploratory Data Analysis: Quantile-Quantile Plots for New York’s Ozone Pollution Data

Exploratory Data Analysis: Quantile-Quantile Plots for New York’s Ozone Pollution Data

Introduction Continuing my recent series on exploratory data analysis, today’s post focuses on quantile-quantile (Q-Q) plots, which are very useful plots for assessing how closely a data set fits a particular distribution.  I will discuss how Q-Q plots are constructed and use Q-Q plots to assess the distribution of the “Ozone” data from the built-in […]

Read more »

On-line learning and teaching resources

September 22, 2013
By
On-line learning and teaching resources

Twenty-first century Junior Woodchuck Guidebook I grew up reading Donald Duck comics. I love the Junior Woodchucks, and their Junior Woodchuck Guidebook. The Guidebook is a small paperback book, containing information on every conceivable subject, including geography, mythology, history, literature … Continue reading →

Read more »

MCMSki IV, Jan. 6-8, 2014, Chamonix (news #9)

September 22, 2013
By
MCMSki IV, Jan. 6-8, 2014, Chamonix (news #9)

This a reminder about the October 15 deadlines for MCMSki IV: First, the early bird rate for the registration ends up on October 15. Second, the young investigator travel support can only be requested up to October 15 as well. Be sure to book your hotel or rental place early too as Chamonix is quite popular in […]

Read more »

Statistical Theater of the Absurd: “Stat on a Hot Tin Roof”

September 22, 2013
By
Statistical Theater of the Absurd: “Stat on a Hot Tin Roof”

Memory lane: Did you ever consider how some of the colorful exchanges among better-known names in statistical foundations could be the basis for high literary drama in the form of one-act plays (even if appreciated by only 3-7 people in the world)? (Think of the expressionist exchange between Bohr and Heisenberg in Michael Frayn’s play […]

Read more »

Guns are cool

September 21, 2013
By
Guns are cool

Reddit has a subreddit Guns are cool which in turn contains the MASS SHOOTINGS IN 2013 page. I pulled those data to see if there was anything of interest to plot or examine. I ended with modelling the frequency of shootings (once a ...

Read more »

Parum PI

September 20, 2013
By
Parum PI

A couple of weeks ago, the MRC-funded research project on the Regression Discontinuity Design (of which I'm the Principal Investigator) has officially started, so I thought I wrote a few lines of update about it, after the couple of posts (here an...

Read more »

“Six red flags for suspect work”

September 20, 2013
By

Raghu Parthasarathy sends along this article by C. Glenn Begley listing six questions to ask when worried about unreplicable work in biology: Were experiments performed blinded? (Even animal studies should be blinded when it comes to the recording and interpretation of the data—do you hear that, Mark Hauser?) Were basic experiments repeated? (“If reports fail […]The post “Six red flags for suspect work” appeared first on Statistical Modeling, Causal Inference,…

Read more »

Theory gets too Much Respect, and Measurement Doesn’t get Enough (60-Second Lecture Video and Transcription)

September 20, 2013
By

In the last post, I told you about Penn's "60-Second Lecture". Mine is now completed, and we had a good time. Watch the video, and you'll have a good laugh at the unflattering opening shot, complete with a barking dog in the background, and the blindin...

Read more »

The gradient of the bivariate normal cumulative distribution

September 20, 2013
By
The gradient of the bivariate normal cumulative distribution

I'm spoiled by the internet. I've grown so accustomed to being able to instantly find an answer to any query—no matter how obscure—that I am surprised when I don't find what I am looking for. The other day I was trying to find a mathematical result: a formula for the [...]

Read more »

Loi de Poisson

September 20, 2013
By

Suite du cours ACT2121, de préparation pour l’examen P de la SOA (probability). Un nouveaux jeu d’exercices, sur le thème 6 (tel que classifié dans le livre de Jacques Labelle, qui servira de référence pour ce cours) Loi de Poisson #6 ACT2...

Read more »

University Rankings over Time

September 20, 2013
By
University Rankings over Time

The QS Rankings are an influential score sheet of universities around the world. They are published annually by Quacquarelli Symonds (QS), a British research company based in London. The rankings for 2013 are out, and I have charted the rankings of this year’s top 10 over the last five years: Observations from this year’s ranking: […]

Read more »

Testing (Introduction to Statistical Computing)

September 20, 2013
By

Lecture 7: Our code implements a method for solving problems we expect to encounter in the future; but why should we trust those solutions? We establish the reliability of the code by testing it. To respect the interfaces of the code, we test the su...

Read more »

Homework: Standard Errors of the Cat Heart (Introduction to Statistical Computing)

September 20, 2013
By

In which we meet the parametric bootstrap traveling incognito probe the precision of our estimation method from the last lab, by seeing how well it would work when the model is true and we know the parameters. Assignment Introduction to Statistical...

Read more »

Cox’s Theorem and Mayo’s Error Statistics

September 19, 2013
By

This post will take a different tack. Rather than criticize the Severity Principle, I will attempt to patch it up. But as we try to fix problems with SEV, we’ll run up against Cox’s Theorem: A measure of evidence like SEV will either be equ...

Read more »

What makes a statistician look like a hero?

September 19, 2013
By

Answer here (courtesy of Kaiser Fung).The post What makes a statistician look like a hero? appeared first on Statistical Modeling, Causal Inference, and Social Science.

Read more »


Subscribe

Email:

  Subscribe