Monthly Archives: December 2009

R Site Search with the ‘sos’ Package

December 15, 2009
By

REvolution Computing is a sponsor of the Bay Area R User Group, which gathered on Tuesday for its monthly meeting. This month's meeting was in a cozy setting at San Jose State University, and was hosted by David Czerwinski who teaches data mining there. The topic at hand was search, and finding R packages to compliment the functionality requirements...

Read more »

Browse R Graphics with the R Graph Gallery and the R Graphical Manual

December 15, 2009
By

One of R's biggest strengths is its unparalleled graphing capabilities.  Just see any of our previous posts on ggplot2, visualization, or other posts tagged with R. R has several fundamentally different systems for plotting, including base graphics, lattice, and ggplot2.  Furthermore, many add-on packages come with their own functions for producing problem-domain specific graphics. For example,

Read more »

R Tutorial Series: Graphic Analysis of Regression Assumptions

December 15, 2009
By
R Tutorial Series: Graphic Analysis of Regression Assumptions

An important aspect of regression involves assessing the tenability of the assumptions upon which its analyses are based. This tutorial will explore how R can help one scrutinize the regression assumptions of a model via its residuals plot, normality h...

Read more »

Object-Oriented Programming in R: The Setter Methods

December 14, 2009
By

With a little guidance from the indefatigable Hadley Wickham, I figured out today how to implement the setter methods that were missing from my example user class. To review, let’s rebuild the getter methods for my user object: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Read more »

NYT on breast cancer screening and probability

December 14, 2009
By

The New York Times last weekend looked at the controversy around the recent changes to the mammogram guidelines from a mathematical perspective. Compared to the analysis based on Bayes' Theorem from the Harvard Social Science Statistics blog (which apparently caused some controversy itself: that post was deleted and later replaced after some errors apparently crept into the calculations), this...

Read more »

The Grammar of Graphics: ggplot2 package

December 14, 2009
By

The grammar of graphics approach to constructing graphs has been implemented in the ggplot2 package in R. The author of the package, Hadley Wickham, has provided a website with many details of using the system to create nice looking graphics. The package removes many of the awkward parts of setting up graphical display that characterise other

Read more »

R 2.10.1 released

December 14, 2009
By

The latest update to R, R 2.10.1, is now available for download in source form from your local CRAN mirror. Binary versions (for Mac, Windows, and Linux) will become available over the next few days. As a maintenance release, this update focuses on minor changes and bug fixes. The complete list of changes is available in the NEWS file,...

Read more »

Example 7.18: Displaying missing value categories in a table

December 14, 2009
By
Example 7.18: Displaying missing value categories in a table

When displaying contingency tables (section 2.3.1), there are times when it is useful to either show or hide the missing data category. Both SAS and the typical R command default to displaying the table only for observations where both factors are observed.In this example, we generate some multinomial data (section 1.10.4) and then produce tables with and without...

Read more »

RQuantLib 0.3.1 released

December 13, 2009
By

A new version of RQuantLib is now out at CRAN and in Debian. It updates the package to the 0.9.9 release of QuantLib and is mostly a maintenance release with a few minor fixes along the way. Full changelog details, examples and more details abo...

Read more »

Galton’s quincunx in R

December 13, 2009
By
Galton’s quincunx in R

Andrej Blejec has a very nice R demo of Galton's quincunx (link1, link2). It is a bit tedious to copy the code from PDF to R console, but it is worth the effort as the demo simulation clearly shows the nature of quincunx. After a bit of search I also f...

Read more »

Sponsors

Mango solutions



RStudio homepage



Zero Inflated Models and Generalized Linear Mixed Models with R

Quantide: statistical consulting and training

datasociety

http://www.eoda.de





ODSC

ODSC

CRC R books series





Six Sigma Online Training









Contact us if you wish to help support R-bloggers, and place your banner here.

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)