270 search results for "PCA"

NIPALS: Principal Components Analysis with "R" (Part: 002)

January 1, 2012
By
NIPALS: Principal Components Analysis with "R" (Part: 002)

We started some posts based on the tutorials of:"Multivariate Statistical Analysis using the R package chemometrics"The first post was:Principal Components Analysis with "R" (Part: 001)Now we continue with a second part.The graphics help us to dec...

Read more »

Top 20 R posts of 2011 (and some R-bloggers statistics)

January 1, 2012
By
Top 20 R posts of 2011 (and some R-bloggers statistics)

R-bloggers.com is now two years young. The site is an (unofficial) online R journal written by bloggers who agreed to contribute their R articles to the site. In this post I wish to celebrate R-bloggers’ second birthmounth by sharing with you: Links to the top 20 posts of 2011 Statistics on “how well” R-bloggers did Read more...

Read more »

Rcpp 0.9.8

December 22, 2011
By

A new release 0.9.8 of Rcpp is now on CRAN and will also get into Debian shortly (once I finish building R 2.14.1). This release contains a few incremental changes. Romain, sponsored by by the Open Source Programs Office at Google, had released a...

Read more »

IRIS Flower Data Set (R-002)

December 17, 2011
By
IRIS Flower Data Set (R-002)

Ver  primero: IRIS Flower Data Set (R-001)See first:        IRIS Flower Data Set (R-001)El comando "summary" nos ayuda a comprender la importancia de cada componente principal:Los "eigenvalues" son las desviacion...

Read more »

Pairs for the "P" (loadings) matrix

December 12, 2011
By
Pairs for the "P" (loadings) matrix

Ver primero: PCA file calculation with "R"See first:         PCA file calculation with "R"Podemos ver los diferentes planos que forman los PCs entre sí, con la función "Pairs" de "R".We can see all the combinat...

Read more »

Visualizing Gestures as Paths

December 11, 2011
By
Visualizing Gestures as Paths

Kaggle is hosting an exciting new competition in which the object is to learn to identify sequences of gestures from just one example of each gesture. I would bet this competition has a lot of potential to attract academics interested in machine learni...

Read more »

Statistics with R – Lots of R Examples

December 8, 2011
By
Statistics with R – Lots of R Examples

“Statistics with R” is a great R graphics & stats website. It provides lots of R examples, covering many analytics topics. It is also available as a PDF document to download at the website, as well as the R codes. … Continue reading →

Read more »

Principal Components Analysis with "R" (Part: 001)

December 7, 2011
By
Principal Components Analysis with "R" (Part: 001)

This is the first "post" of my new adventure with a software that I consider very interesting and that give to people the oportunity to work with Chemometrics ("R" is free).To follow these examples, yo can download the following article:"Multivariate S...

Read more »

Empirical Orthogonal Function (EOF) Analysis for gappy data

November 24, 2011
By
Empirical Orthogonal Function (EOF) Analysis for gappy data

The following is a function for the calculation of Empirical Orthogonal Functions (EOF). For those coming from a more biologically-oriented background and are familiar with Principal Component Analysis (PCA), the methods are similar. In the climate sciences the method is usually used for the decomposition of a data field into dominant spatial-temporal modes. Read...

Read more »

Web Scraping Yahoo Search Page via XPath

November 10, 2011
By
Web Scraping Yahoo Search Page via XPath

Seeing as I’m on a bit of an XPath kick as of late, I figured I’d continue on scraping search results but this time from Yahoo.com Rolling my own version of xpathSApply to handle NULL elements seems to have done the trick and so far it’s been relatively easy to do the scraping. I’ve created

Read more »