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- breast cancer, rare diseases, and bayes rule, revisedHappy Thanksgiving! Last Thursday, I posted about the recent government recommendations regarding breast cancer screening in women ages 40-49. At least one of you wrote me to say that one of my calculations might have been slightly off (they were), and so I did some more investigation on this issue, as well as on new recommendations on cervical pap smears. ( […]
- Violations of SUTVANetwork methods and methods for causal inference are popular areas of research in social sciences. Often they are considered separately due to a fundamental difference in their basic assumptions. Network methods assume that individual units are interdependent, that one network member's actions have consequences for other members of the network. Methods […]
- Dynamic Panel ModelsI have been toying around with dynamic panel models from the econometrics literature and I have hit my head up against a key set of assertions. First, a quick setup. The idea with these models is that we have a set units which we measure at different points in time. For instance, perhaps we survey a group of people multiple times in the course of an election […]
- Greiner on "Exit Polling and Racial Bloc Voting"Please join us at the Applied Statistics workshop this Wednesday, November 18th at 12 noon when we will be happy to have Jim Greiner of the Harvard Law School presenting on "Exit Polling and Racial Bloc Voting: Combining Individual-Level and R x C Ecological Data." Jim has provided a companion paper with the following abstract: Despite its shortcom […]
- Choosing variances in general linear modelsToday I'm going to talk about a particular problem from my own research and will outline a method for choosing variances in general linear models (GLMs), but I am also asking a question.
- Bill Support by Page LengthThere was a lot of press on the 1,000+-page length of the House health care bill, H.R. 3962. That got me thinking... didn't we hear the same thing about the stimulus bill and the Patriot Act? Aren't most "controversial" bills also very long? It would make sense. Controversial bills require a lot more ink -- pork, special cases, exceptions […]
- Answering "why" questionsBrandon Stewart pointed me to an interesting blog post by Andrew Gelman that touches on the issue of explaining the "causes of effects." The basic point is that "why" questions are difficult to answer in a potential outcomes framework but often we really care about them. Some folks in political science have gone so far as to argue that re […]
- Just in time for "Superfreakonomics"A friend recently pointed me to a 2007 New Republic article in which the author, Noam Scheiber, argues that the "Freakonomics" phenomenon is lamentable because it represents a trend toward research in which clever identification strategies are prized over attempts to answer what Scheiber calls "truly deep questions." Although two years an […]
- Airoldi on "A statistical perspective on complex networks"I hope you can join us at the Applied Statistics Workshop this Wednesday, November 4th, when we will be happy to have Edo Airoldi, Assistant Professor in the Department of Statistics here at Harvard. Edo will be presenting a talk entitled "A statistical perspective on complex networks" for which he has provided the following abstract: Networks are […]
- Happy HalloweenIt made my day when this showed up in my inbox this morning. I'm glad to see someone knows what to do if/when the zombie outbreak occurs.
I need someone to help me with my dissertation (I live in Singapore) and I’m using SEM (structural equation modeling) in Lisrel
Tks
Luciana
Just YM me at esstat17@yahoo.com for any consultation.. I’m available at 9pm – 6am, +8GMT