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• Lattice when modeling, ggplot when publishing

  When working in research projects I tend to fit several, sometimes quite a few, alternative models. This model fitting is…
  18 Oct, '11

• Linear mixed models in R

  A substantial part of my job has little to do with statistics; nevertheless, a large proportion of the statistical side…
  17 Oct, '11

• Maximum likelihood

  This post is one of those ‘explain to myself how things work’ documents, which are not necessarily completely correct but…
  14 Oct, '11

• Simulating data following a given covariance structure

  Every year there is at least a couple of occasions when I have to simulate multivariate data that follow a…
  13 Oct, '11

• Setting plots side by side

  This is simple example code to display side-by-side lattice plots or ggplot2 plots, using the mtcars dataset that comes with…
  12 Oct, '11

• Upgrading R (and packages)

  I tend not to upgrade R very often—running from 6 months to 1 year behind in version numbers—because I had…
  11 Oct, '11

• Reading HTML pages in R for text processing

  We were talking with one of my colleagues about doing some text analysis—that, by the way, I have never done…
  11 Oct, '11

• Operating on datasets inside a function

  There are times when we need to write a function that makes changes to a generic data frame that is…
  10 Oct, '11

• A brief idea of style

  Once one starts writing more R code the need for consistency increases, as it facilitates managing larger projects and their…
  9 Oct, '11

• All combinations for levelplot

  In a previous post I explained how to create all possible combinations of the levels of two factors using expand.grid().…
  8 Oct, '11