Plotting Time Series data using ggplot2

September 30th, 2010

There are various ways to plot data that is represented by a time series in R. The ggplot2 package has scales that can handle dates reasonably easily. Read the rest of this entry »

Classification Trees using the rpart function

September 21st, 2010

In a previous post on classification trees we considered using the tree package to fit a classification tree to data divided into known classes. In this post we will look at the alternative function rpart that is available within the base R distribution. Read the rest of this entry »

Classification Trees

September 18th, 2010

Decision trees are applied to situation where data is divided into groups rather than investigating a numerical response and its relationship to a set of descriptor variables. There are various implementations of classification trees in R and the some commonly used functions are rpart and tree. Read the rest of this entry »

Creating a Presentation with LaTeX Beamer – Frame Transitions

September 4th, 2010

Transitions are often used in presentations to break up the presentation and to keep the audience awake, but often the outcome is irritation/distraction with text or other objects flying on or off the screen from different directions. As such they should be used sparingly if at all in a talk. LaTeX beamer has a simple mechanism for including transitions in a presentation Read the rest of this entry »