R Bloggers: The Site I Wish Existed in 2007

  My first experience with R was in 2007 as a sophomore in undergrad.  As part of a larger project on pricing day-ahead electricity futures, I wanted to cluster locational marginal price (LMP) data from the ISO-NE.  Something like k-means is easy to plot and visualize in low-dimensions, but this data was better approached by hierarchical methods.

By |2011-02-19T10:58:10-05:00February 19th, 2011|Programming|1 Comment
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Pre-processing text: R/tm vs. python/NLTK

  Let's say that you want to take a set of documents and apply a computational linguistic technique.  If your method is based on the bag-of-words model, you probably need to pre-process these documents first by segmenting, tokenizing, stripping, stopwording, and stemming each one (phew, that's a lot of -ing's).     In the past, I've relied

By |2011-02-16T10:12:07-05:00February 16th, 2011|Programming|15 Comments
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