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 »
Project Gutenberg offers free books that are in the public domain (eg, copyright has expired). Some of the Math books are even typewritten using LaTeX. Cool!
I’m debating the idea (hype) of flipping the classroom for one of my classes next Fall where students watch lecture videos at home (or elsewhere) so I could spend class time doing more hands-on activities like discussing the art of data analysis and how to solve problems with statistics. I think Khan Academy, Udacity, and… Read more »
This is an excellent post explaining why some presentations suck and how to succeed in your own oral presentations. I have much to work on.
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.
The Washington Post keeps a list here. There is also the UCI Machine Learning Repository. UPDATE 2012-03-29: Genome data of 1000+ individuals per this post.
I enjoyed this post. What did I learn? Don’t immediately jump to making slides when you have to give a presetation. If you have to use slides to help facilitate your presentation, start out by writing prose. That is, tell your story. Then make your slides. For a 20 minute presentation, try to stick to… Read more »
Believe it or not, I recently had to use SAS for a simulation study because it was the only system available that could maximize the exact partial likelihood of a Cox proportional hazards model for tied data (ties=exact) in a reasonable amount of time for a data set of 2,000 observations. This was the first… Read more »
When installing SAS on an Ubuntu machine, I ran into issues like /bin/sh being linked to /bin/dash instead of /bin/bash and the deployment wizard not starting. This post helped me resolve my issues. Basically: sudo rm /bin/sh sudo ln -s /bin/bash /bin/sh sudo apt-get install xauth x11-apps libstdc++5 ia32-libs libxp6 ## deployment wizard not starting… Read more »