Jul 9, 2013 — Install R Packages (that require compilation) on Linux — When trying to install packages in R that require compiling on one of my servers (that I did not have admin access to) I ran into the following error: ERROR: 'configure' exists but is not executable -- see the 'R... Read more

Jul 8, 2013 — Bootstrapping — Bootstrapping is another strategy (like cross validation) that we can use for validation or parameter estimation if there is not enough data.  The technique is simple: we basically do random sampling from the original dataset to generate a larger dataset... Read more

Jul 8, 2013 — Standard Errors and Confidence Intervals — I’ve been reading over beautiful notes from STATS315A (thanks to my awesome fellow graduate student Katie!), one of the three statistics courses I wanted to take, but haven’t been able to squeeze in (yet!)   The course notes provide beautifully... Read more

Jul 6, 2013 — Hierarchical Clustering — Hierarchical clustering is a clustering algorithm that aims to create groups of observations or classes based on similar features, x.  It is commonly used for microarray or genetic analysis to find similar patterns of expression, and I’m sure that you’ve seen... Read more