Category Archives: Uncategorized

Knoxville R Users Group Formed, Free Training Offered

Posted on April 8, 2013 by

R is popular free and open-source software for graphics and data analytics. The Knoxville R Users Group is being formed to help people learn R and improve their skills with it. Three departments of The University of Tennessee are working together … Continue reading →

Posted in Analytics, R, Statistics, Uncategorized | 2 Comments

R Tackles Big Garbage

Posted on March 1, 2013 by

April 1, 2013 – Although the capabilities of the R system for data analytics have been expanding with impressive speed, it has heretofore been missing important fundamental methods. A new function works with the popular plyr package to provide these missing … Continue reading →

Posted in Analytics, R, SAS, Statistics, Uncategorized | 8 Comments

Comparing Transformation Styles: attach, transform, mutate and within

Posted on January 22, 2013 by

There are several ways to perform data transformations in R. Each has its own set of advantages and disadvantages. Let’s take one variable, square it and add 100. How many ways might an R beginner screw up such a simple … Continue reading →

Posted in Analytics, Data Mangement, R, Uncategorized | 9 Comments

R for SAS, SPSS, Stata Users Workshop Redesigned

Posted on October 2, 2012 by

My workshop R for SAS, SPSS and Stata Users has been popular over the years, but it’s time for an overhaul. A common request has been to simplify it, so I have moved data management to a separate 4-hour workshop, … Continue reading →

Posted in Analytics, R, SAS, SPSS, Statistics, Uncategorized | 1 Comment

Specifying Variables in R

Posted on September 25, 2012 by

R has several ways to specify which variables to use in an analysis. Some of the most frustrating errors can result from not understanding the order in which R searches for variables. This post demonstrates that order, hopefully smoothing your … Continue reading →

Posted in Analytics, R, Statistics, Uncategorized | Tagged , | Leave a comment

Why R is Hard to Learn

Posted on June 13, 2012 by

The open source R software for analytics has a reputation for being hard to learn. It certainly can be, especially for people who are already familiar with similar packages such as SAS, SPSS or Stata. Training and documentation that leverages … Continue reading →

Posted in Analytics, R, SAS, SPSS, Statistics, Uncategorized | Tagged , , , , , | 24 Comments

Things I’ve Learned About WordPress.com

Posted on May 5, 2012 by

I’m almost done moving this site from Google Sites to WordPress. This post describes some of the some things I’ve learned about WordPress.com. By default, WordPress.com makes your site look like a blog. I preferred it look like a web … Continue reading →

Posted in Uncategorized | 2 Comments

Trying Out WordPress

Posted on April 25, 2012 by

I’ve had my site http://r4stats.com on Google Sites for a few years now and it’s time to try something new. Most of the articles there are not very blog-like. For example, The Popularity of Data Analysis Software is an article … Continue reading →

Posted in Uncategorized | 1 Comment