Especially for programmers that come to R from other languages, R sometimes gets dinged about the speed of its for loops. But a lot of the time, where you might have needed an iterative loop in another language to solve a specific task, you don't need a for loop in R at all. Often, there's a pre-build function to...
Monthly Archives: November 2010
Example 8.14: generating standardized regression coefficients
Standardized (or beta) coefficients from a linear regression model are the parameter estimates obtained when the predictors and outcomes have been standardized to have variance = 1. Alternatively, the regression model can be fit and then standardized ...
Feature selection: All-relevant selection with the Boruta package
Feature selection is an important step for practical commercial data mining which is often characterised by data sets with far too many variables for model building. There are two main approaches to selecting the features (variables) we will use for the analysis:...
Feature selection: All-relevant selection with the Boruta package
Feature selection is an important step for practical commercial data mining which is often characterised by data sets with far too many variables for model building. There are two main approaches to selecting the features (variables) we will use for the analysis:...
Isarithmic History of the Two-Party Vote
A few weeks ago, I shared a series of choropleth maps of U.S. presidential election returns, illustrating the relative support for Democratic, Republican, and third Party candidates since 1920. The granularity of these county level results led me to wonder whether it would be possible to develop an isarithmic map of presidential voting using the … Read more
Introducing Monte Carlo in PaRis
As already announced on Statisfaction, I will start a short course in English based on Introducing Monte Carlo Methods with R at ENSAE next Tuesday. The slides were written by George Casella for a course he gave in Italy last spring and he kindly agreed on making them available on slideshare: Filed under: 
ZAT! 2010
Tomorrow is the last day to enjoy the first edition of Montpellier's ZAT! (Zones Artistiques Temporaires). I was there this afternoon and tonight, but I found it much more picture worthy tonight: Other people have also taken pictures and sha...
Reporting Standard Errors for USL Coefficients
In a recent Guerrilla CaP Group discussion, Baron S. wrote:
....The Gnuplot output includes the errors for each of the universal scalability law (USL) coefficients. A question about the magnitude of...
BS> Using gnuplot against the dataset I gave, I get
BS> sigma 0.0207163 +/- 0.001323 (6.385%)
BS> kappa 0.000861226 +/- 5.414e-05 (6.287%)
Reporting Standard Errors for USL Coefficients
In a recent Guerrilla CaP Group discussion, Baron S. wrote:
....The Gnuplot output includes the errors for each of the universal scalability law (USL) coefficients. A question about the magnitude of...
BS> Using gnuplot against the dataset I gave, I get
BS> sigma 0.0207163 +/- 0.001323 (6.385%)
BS> kappa 0.000861226 +/- 5.414e-05 (6.287%)
My Day at ACM Data Mining Camp III
My first time at ACM Data Mining Camp was so awesome, that I was thrilled the make the trip up to San Jose for the November 2010 version. In July, I gave a talk at the Emerging Technologies for Online Learning Symposium conference with a faculty member in the Department of Statistics, at the Fairmont. The place was amazing,...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
