2646 search results for "GIS"

Ecological SEMs and Composite Variables: What, Why, and How

May 2, 2011
By
Ecological SEMs and Composite Variables: What, Why, and How

I’m a HUGE fan of Structural Equation Modeling. Heck, I’ve even begun teaching short SEM workshops. (seriously, if you want, email me and we’ll talk). For those of you unfamiliar with the technique, it’s awesome for three main reasons. It’s a method of teasing apart direct and indirect interactions in your data. It allows you

Read more »

Parallelizing and cross-validating feature selection in R

April 29, 2011
By
Parallelizing and cross-validating feature selection in R

This is an example piece of code for the Overfitting competition at kaggle.com. This method has an AUC score of ~.91, which is currently good enough for about 38th place on the leaderboard. If you read the completion forums closely, you will find code...

Read more »

RStudio is good for you

April 29, 2011
By
RStudio is good for you

I was recently introduced to RStudio, a new integrated development environment for R, it is just amazing! It is free, and open, compatible with PC/Mac/Linux OSs. You can also choose to run it in the cloud, and access it from your favorite web browser. As you can see, the window divides into four in a

Read more »

Easy way to get yield curve : what you need is only "FRBData" package !

April 28, 2011
By
Easy way to get yield curve : what you need is only "FRBData" package !

I made FRBData package and registerd it on CRAN.This package allow you to download financial data from FRB's website.This website provide many economical data such as consumer credit, money stock.This article show you how to use this package.(But, it has only a function about interest rate now. I will create other functions to download other macro-economical data in next version.) First,...

Read more »

Easy way to get yield curve : what you need is only "FRBData" package !

April 28, 2011
By
Easy way to get yield curve : what you need is only "FRBData" package !

I made FRBData package and registerd it on CRAN.This package allow you to download financial data from FRB's website.This website provide many economical data such as consumer credit, money stock.This article show you how to use this package.(But, it has only a function about interest rate now. I will create other functions to download other macro-economical data in next version.)First,...

Read more »

Can you do better than cap-weighted equity benchmarks?

April 28, 2011
By

We're on our way to Chicago for the annual conference for R users in Finance, R/Finance 2011. Revolution Analytics is proud to once again sponsor this conference, and during the sponsor lunch session at noon on Saturday, we're honoured to have Guy Yollin show how the big-data capabilities of Revolution R Enterprise can be used for quantitative finance. Here...

Read more »

Job Search Part 5: It’s Policy Time!

April 27, 2011
By
Job Search Part 5: It’s Policy Time!

This is the last post of this special mini-series on the job search and matching theory of unemployment. I will probably be extremely distracted for the next few months, including a month-long vacation in Europe to shake the horrors of undergrad off me...

Read more »

DST is a b!tch, be careful with POSIX in a stupid timezone

April 27, 2011
By
DST is a b!tch, be careful with POSIX in a stupid timezone

At the department we have been analyzing some transaction data for some time. We got a new dataset with lots of transactions. Once you need interpurchase (IPT) times, posix is quite useful, as you can easily difference transactions to generate IPTs.So ...

Read more »

Plotting Maps with R

April 26, 2011
By
Plotting Maps with R

I stumbled upon this tutorial while not studying and I thought it would be fun to try and plot maps of the San Francisco Bay Area household income, education, population density, poverty, etc...To do this I needed a Shapefile for the Bay Area zip codes similar to the London borough file used in...

Read more »

New functions for linear model inference in Revolution R Enterprise 4.3

April 26, 2011
By

The latest release of Revolution R Enterprise shows how Revolution Analytics’ package for big data, RevoScaleR, is continuing add new capabilities for Big Data statistics. RevoScaleR removes the limits on the size of the data that can be processed in R through the use of the highly efficient .Xdf binary file format. Xdf stores data by rows within columns...

Read more »