I’ve been using Graphviz to create better decision tree graphics “by hand” for rpart objects created in R (final tree). I stumbled on this post that shows how one could convert an rpart object to a party project via the as.party function in partykit to utilize the plot functions in party. It looks quite nice…. Read more »
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).
This post has a good list of available math software.
I like this 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 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 »