Comparing Public and Private Schools
This a PDF of the poster I will be presenting at the Division of Educational Psychology & Methodology annual poster session on May 2, 2011. Comparing Public & Private Schools: An International...
View ArticleManaging a Local R Repository
I will be teaching a workshop on R and LaTeX at NEAIR in just under a month. One of the issues I will encounter is a lack of Internet access. I also work with restricted data from NCES which requires...
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Retrieving RSS Feeds Using Google Reader
I have been working on a new package makeR to help manage Sweave projects where you wish to create multiple versions of documents that are based on a single source. For example, I create lots of...
View ArticleObject Oriented Programming in R
As someone who was a Java programmer for many years learning R’s object oriented programming framework has been frustrating to say the least. I like the simplicity of S3 but find it limiting when you...
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Given a room with n people in it, what is the probability any two will have...
Revisiting a fun puzzle I remember first encountering as an undergraduate. Nice example of creating a plot in R using ggplot2. I also plot the probability of someone in the room having the same...
View ArticlemakeR: An R Package for Managing Document Building and Versioning
If you are reading this vis-à-vis R-Bloggers, then you know how good R, LaTeX, and Sweave are for generating reports and/or conducting reproducible research. It has been particularly valuable for me in...
View ArticleSetting Up and Customizing R
For the longest time I resisted customizing R for my particular environment. My philosophy has been that each R script for each separate analysis I do should be self contained such that I can rerun the...
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Graphic Parameters (symbols, line types, and colors) for ggplot2
Following up on John Mount’s post on remembering symbol parameters in ggplot2, I decided to give it a try and included symbols, line types, and colors (based upon Earl Glynn’s wonderful color chart)....
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Visualizing Likert Items [Updated]
This post has been updated to reflect several changes to how these functions work. Specifically, an intermediate function likert is used to perform the item summary. The plot functions have been...
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User Input using tcl/tk
I was inspired by Kay Cichini recent post on creating a a tcl/tk dialog box for users to enter variable values. I am going to have a use for this very soon so took some time to make it a bit more...
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