Monthly Archives: September 2009

R: The Dummies Package

September 30, 2009
By

R-2.9.2 was released in August. While R can be considered stable and battle-ready, it is also far from stagnation. It is humbling to see such an intelligent and vibrant community helping CRAN grow faster than ever. Every day I see a new package or read a new comment on R-Help

Read more »

Measuring performance of functions in R

Measuring performance of functions in R

In R you can use the system.time(function) function to test the time it takes to execute a function. Because I had to do some extended performance testing in R, I wrote a new function based on system.time which gives you the possibility to run multiple...

Read more »

Examples using R – Analysis of Variance

September 30, 2009
By
Examples using R – Analysis of Variance

Problem: A product development engineer is interested in investigating the tensile strength of a new synthetic fiber that will be used t omake cloth for men’s shirts. The engineer knows from previous experience that the strength is affected by he weight percent of cotton used in the blend of materials for the fiber. Furthermore, she… Read More »

Read more »

Example 7.14: A simple graphic of sales

September 29, 2009
By
Example 7.14: A simple graphic of sales

In this example, we show a simple plot of the sales rank data read in as shown in example 7.13.SASIn SAS, we use the symbol statement (section 5.3) to request small (with the h option) dots (with the v option, and that the dots not be connected (with the i option. (See sections 5.2.2, 5.3.9 for more details.)we...

Read more »

RInside release 0.1.1, and a fresh example

September 29, 2009
By

Last week's 0.1.0 release of RInside, and the first to have been published on CRAN, still had some issues with builds and use on OS X. Thanks to testing and fixes by Jan de Leeuw, Jeff Horner and particularly Simon Urbanked, things are said to be better now with the new release 0.1.1 which went onto CRAN yesterday. So no new features,...

Read more »

WordPress Blogging with R in 3 Steps

September 29, 2009
By
WordPress Blogging with R in 3 Steps

A few people have emailed me and enquired about the use of tools mentioned at the end of this post to make blogposts with embedded R-commands. Below is a small step-by-step walkthrough of how to accomplish this. Write your blog post in a simple tex...

Read more »

Survive R

September 29, 2009
By

New PDF slides version (presented at the Bay Area R Users Meetup October 13, 2009). We at Win-Vector LLC appear to like R a bit more than some of our, perhaps wiser, colleagues ( see: Choose your weapon: Matlab, R or something else? and R and data ). While we do like R (see: Exciting Related posts:

Read more »

Blogs on R | Statistics

September 28, 2009
By
Blogs on R | Statistics

What are the current blogs on R? What do they cover?What makes a good blog on R?Of course different readers look for different things, but for me a good blog on R:Provides a Gateway: The blog discovers and shares useful external material and expla...

Read more »

Adjusting Correlations for Reliability | Attenuation Formula

September 28, 2009
By
Adjusting Correlations for Reliability | Attenuation Formula

This post discusses ways of adjusting correlations for reliability.Classical Test Theory states that an Observed variable is True Score plus Error. The true score variable is latent. In psychology theoretical interest typically relates more to the late...

Read more »

Psychology Statistics 101 | R or SPSS

September 28, 2009
By
Psychology Statistics 101 | R or SPSS

Dan Wright has placed his Quantitative Methods 1 course online. The course offers instructions both in R and SPSS (PASW).It is an interesting case study in  how to integrate R into a psychology quantitative methods course at the undergraduate leve...

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)