This post does a fantastic job of the Mahalanobis distance. Basically, one can think of it as a multivariate generalization of the z-score. That is, the standardized distance of a vector from the origin (mean vector).
I like [this](http://www.npr.org/2011/04/08/135241857/sifting-genes-for-clues-to-alzheimers) podcast. It discusses some recent findings about genes possibly relating to Alzheimer’s Disease. In it, the guest speaks of not having a hypothesis going into the study. Then the host (or another guest) raised the question of conducting a study without a pre-defined hypothesis. The keyword was “hypothesis generation.” I’m happy this read more
Had to share [this](http://www.r-statistics.com/2010/09/managing-a-statistical-analysis-project-guidelines-and-best-practices/) link today as I better read all the content it refers to and incorporate a lot of the recommended practices into my work flow. Thanks Tal Galili for compiling all those information.
so these articles are ‘old news,’ but here i am to blog it down before i forget. First article is entitled “For Today’s Graduate, Just One Word – Statistics,” and the second article is entitled “Data Analysts Captivated by R’s Power.” It really does feel re-enforcing and motivating when the NY Times write about your read more
I blogged about Sage in the past and stated that I won’t be using it much since R is my language/environment of choice. This is still true, but I wanted to write a few more comments about Sage after toying with it a bit more. Sage is based on Python (good!) and its mission statement read more
I remember my first encounter to the classical linear regression model with normally distributed errors by Dan Gillen in Stat 120c in spring 2005 at UCI. I mean, I’ve done linear regression in high school science classes: you get a best fit line out of your data. In the stat class, I remember seeing data read more
Check out the movie15 package for including multimedia inside in Beamer slides. Some references are here, here, and here. Note that movies are currently playable in only Adobe Reader/Acrobat. Mac’s Preview and other pdf readers currently do not support it. However, I know hope support will be given in the near future.
Been wanting to do an interactive/animated plot like the one here for a while (go to the Taylor example). Sage looks like a good program to generate animated graphics, but R is my primary language of choice as a statistician. I don’t want to learn another language just for a single feature (although the other read more
