Bad Hessian » Adam

The graph above recently appeared as part of Scott Walker’s Twitter feed. Presumably, the idea is to suggest that under Walker’s leadership, Wisconsin has done better than the country as a wh...

https://badhessian.org/2015/08/multilevel-models-and-political-advertising/

In network analysis, blockmodels provide a simplified representation of a more complex relational structure. The basic idea is to assign each actor to a position and then depict the relationship ...

https://badhessian.org/2015/05/concor-in-r/

I just wanted to pass along some info on behalf of our pal Craig Tutterow who has been working hard on socilab, a cool new project which magically transforms your LinkedIn data into network-based...

https://badhessian.org/2013/12/the-latest-in-online-network-analysis/

A couple of months ago a friend directed me to a piece by the New Yorker which included a nice interactive map depicting the landscape of craft brewing in the United States based on data provided...

https://badhessian.org/2013/09/craft-brewing-in-the-usa-2/

The quote above comes from Firebaugh and Gibbs’s “User’s Guide to Ratio Variables” (1985: 718). I first ran across this article a couple of years ago but only just got around to reading i...

https://badhessian.org/2013/03/widespread-failure-to-appreciate-this-distinction-has-wasted-journal-space-confused-readers-and-resulted-in-solutions-to-phantom-problems-2/

As it turns out, logistic regression is much harder than it looks. Actually, the hard part is trying to compare the results of logistic regression across models. The basic gist of the problem is ...

https://badhessian.org/2012/11/whats-the-matter-with-logistic-regression/

What do we do when we think that a particular set of effects is likely to vary significantly across groups? There seem to be two basic approaches: we can either (a) run separate models for each g...

https://badhessian.org/2012/08/the-potentially-non-existent-effect-of-disaggregation/

Most of the spatial data I work with begins its life as a shapefile. While there are a number of tools available for dealing with shapefiles in R, it is often easier to work in dedicated geograph...

https://badhessian.org/2012/07/system-commands-in-r/

In a previous post I made a reference to the estimation of equilibrium effects in the context of a spatial lag model. This is a question which has received surprisingly little attention given tha...

https://badhessian.org/2012/07/that-coefficient-doesnt-mean-what-you-think-it-does/

Loops are great. They save us lots of work and they solve all sorts of problems. Sometimes, however, there are better ways of going about things. In the first place, we are often using loops to i...

https://badhessian.org/2012/07/loops-matrices-and-apply-functions/