If you want to learn R, or improve your current R skills, join me for two workshops that I’m offering through Revolution Analytics in October. If you already know another analytics package, the workshop, Intro to R for SAS, SPSS … Continue reading →
Tag: R
Trends in the Analytics Job Market
Tracking the job market for statistics, analytics, data mining and the like used to be a major undertaking. However, on November 10, 2011 the world’s largest web site for job postings, Indeed.com, released a tool that allows you to examine trends … Continue reading →
Calculate RMSE and MAE in R and SAS
Here is code to calculate RMSE and MAE in R and SAS. RMSE (root mean squared error), also called RMSD (root mean squared deviation), and MAE (mean absolute error) are both used to evaluate models. MAE gives equal weight to all errors, while RMSE gives…
Use doParallel for rolling regression in R
Rolling regression for a large data set costs lots of resources. There are a few strategies to speed up this process. For example, in R, there is a rollapply function in the dynlm package. In SAS, PROC FCMP is one of the…
The US airports with most flight routes
The summer just begins and a lot of people start to experience flight delay. I am also interested in seeing which cites in the US are well connected by flights. The OpenFlights project provides free flight information. Then I used R to d…
Webinar: Managing Data with R
Before you can analyze data, it must be in the right form. Join Revolution Analytics and me this June 21st for a 4-hour webinar that shows how to perform the most commonly used data management tasks in R. We will work through … Continue reading →
SAS Dominates Analytics Job Market; R up 42%
I’m continuing to gather and analyze data to update The Popularity of Data Analysis Software. In this installment I cover the latest employment figures. Employment is important to us all, so what software skills are employers seeking? A thorough answer … Continue reading →
Forecast Update: Will 2014 be the Beginning of the End for SAS and SPSS?
I recently updated my plots of the data analysis tools used in academia in my ongoing article, The Popularity of Data Analysis Software. I repeat those here and update my previous forecast of data analysis software usage. Learning to use … Continue reading →