R is a statistical programming language, with a strong focus on mathematical operations. When writing code that is math-heavy, unit testing becomes very...
0 replies - 1416 views - 01/30/13 by Gary Sieling in Articles
Optimization is a very common problem in data analytics. Given a set of variables (which one has control), how to pick the right value such that...
0 replies - 917 views - 01/15/13 by Ricky Ho in Articles
As mentioned in the Appendix of Modern Actuarial Risk Theory, “R (and S) is the ‘lingua franca’ of data analysis and statistical computing, used in...
0 replies - 1282 views - 01/14/13 by Arthur Charpentier in Articles
R is a programming language focused on solving statistical and mathematical calculations. R programs often operate on large, in-memory data...
0 replies - 1813 views - 01/07/13 by Gary Sieling in Articles
A geo-quick-tip: With the osmar and maptools package you can easily pull an OpenStreetMap object and convert it to KML, like below...
0 replies - 1212 views - 01/04/13 by Kay Cichini in Articles
ExtJS Sample codehttp://garysieling.com/blog/tag/extjsThroughout the year I wrote a couple dozen how-to samples of ExtJS code. This product seems to be poorly...
0 replies - 1820 views - 01/02/13 by Gary Sieling in Articles
On February 15th, IFM2, the Institute of Financial Mathematics in Montréal will organize an (one day) Executive workshop on Econometric Modeling in...
0 replies - 1153 views - 12/21/12 by Arthur Charpentier in Articles
Statistical analysis helps many companies navigate the unsteady landscape of fulfillment and demand. Recently we ran across this seminar that explains how John...
0 replies - 3612 views - 12/12/12 by Eric Gregory in Articles
Yesterday, Christopher asked me how to store an R object, to save some time, when working on the project. First, download the csv file for searches...
0 replies - 2167 views - 12/03/12 by Arthur Charpentier in Articles
I recommend using Python for data analysis, and I recommend Wes McKinney’s book Python for Data Analysis.
I prefer Python to R for mathematical computing...
0 replies - 15806 views - 10/24/12 by John Cook in Articles
To many people, R is like the Everglades. They’ve heard of it, they know it’s big and has amazing treasures deep inside. Articles in the media can make it...
0 replies - 2506 views - 10/22/12 by Jonathan Callahan in Articles
I’ve been asked how to do this several times, so I thought it might help to put an example online.x <- 1:5
y1 <- rnorm(5)
y2 <-...
0 replies - 2567 views - 10/16/12 by Rob J Hyndman in Articles
Surprisingly, many statisticians see cross-validation as
something data miners do, but not a core statistical technique....
0 replies - 2263 views - 10/14/12 by John Cook in Articles
Someone asked me yesterday for R code to compute the probability P(X > Y + δ) where X and Y are independent beta random variables. I’m posting the...
0 replies - 2240 views - 10/13/12 by John Cook in Articles
This post is from my new book Forecasting: principles and practice, available freely online at OTexts.com/fpp/.
A non-seasonal ARIMA...
0 replies - 2581 views - 10/09/12 by Rob J Hyndman in Articles
