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• 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

• On R versus SAS

  A short while ago there was a discussion on linkedin about the use of SAS versus R for the enterprise.…
  7 Oct, '11

• Linear regression with correlated data

  I started following the debate on differential minimum wage for youth (15-19 year old) and adults in New Zealand. Eric…
  6 Oct, '11

• R pitfall #1: check data structure

  A common problem when running a simple (or not so simple) analysis is forgetting that the levels of a factor…
  5 Oct, '11

• All combinations of levels for two factors

  There are circumstances when one wants to generate all possible combinations of levels for two factors. For example, factor one…
  4 Oct, '11

• “Not in” in R

  When processing data it is common to test if an observation belongs to a set. Let’s suppose that we want…
  4 Oct, '11

• A shoebox for data analysis

  Recidivism. That’s my situation concerning this posting flotsam in/on/to the ether. I’ve tried before and, often, will change priorities after…
  4 Oct, '11

• Python code to simulate the Monty Hall problem

  I always struggled to understand the Monty Hall Problem, which popped up again in William Briggs’s site. The program assumes…
  24 Apr, '11