lme4 and its cousin arm are extremely useful for a huge variety of modeling applications (see Gelman and Hill’s book), but today we’re going to do something a little frivolous with them. Namely, we’re going to extend our Denver Debat...
Blog Archives
Text analysis made too easy with the tm package
Today’s Gist takes the CNN transcript of the Denver Presidential Debate, converts paragraphs into a document-term matrix, and does the absolute most basic form of text analysis: a raw word count. There are actually quite a few steps in this proc...
Everything is a Network, featuring the sna package
We’ve gotten some requests, through the Ask us anything page, to do some plotting of networks. We may come back to this later, but today’s Gist shows how you can plot pretty much literally anything as a network. First, we go back to our
Fuzzy clustering with fanny()
This is kind of a fun example, and you might find the fuzzy clustering technique useful, as I have, for exploratory data analysis. In this Gist, I use the unparalleled breakfast dataset from the smacof package, derive dissimilarities from breakfast it...
Multidimensional metric unfolding with SMACOF
SMACOF stands for “Scaling by MAjorizing a COmplicated Function,” and it is a multidimensional scaling algorithm for metric unfolding of, among other things, rectangular ratings matrices. One neat Political Science application of MDS is i...
US State Maps using map_data()
Today’s short post will show how to make a simple map using map_data(). Let’s assume you have data in a CSV file that may look like this: Notice the lower case state names; they will make merging the data much easier. The variable of inte...
"Economics-style" graphs with bezier() from Hmisc
So, I really think this one is pretty cool. We spend much of our time in R making graphs with data, but what if you have a theory that you’d like to express graphically? Something like what I’ll call “economics-style” graphs, i...
Handling missing data with Amelia
So, what if you have data, but some of the observations are missing? Many statistical techniques assume no missingness, so we might want to “fill in” or rectangularize our data, by replacing missing observations with plausible substitutes....
Evaluating term popularity with twitteR
I really wanted to put something together for this series on the twitteR package. Unfortunately, at the moment the number of interesting things than can be done with twitteR, as opposed to through API calls and RCurl, is limited. Regardless, I have Ye...
Dot-density maps with spsample()
Today’s example is a little odd, in that the code isn’t pretty and the example isn’t really something you’d actually produce in real life — but if you’ll overlook those oddities, you’ll find that the spsample(...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
