Monthly Archives: January 2012

Analyzing US Government Contract Awards in R

January 23, 2012
By
Analyzing US Government Contract Awards in R

As I was exploring open data sources, I came across USA spending. This site contains information on US government contract awards and other disbursements, such as grants and loans. In this post, we will look at data on contracts awarded in the state of Maryland in the fiscal year 2011, which is available by selecting "Maryland"...

Read more »

ACT to SAT M+V Concordance Chart in R

January 23, 2012
By

For those of who work in Enrollment Management and routinely analyze higher ed data, I wanted to share an easy way to convert ACT to equivalent SAT M+V scores in R. I am dynamically building a dataset that uses the concordance chart located here. Simply, use this data frame and merge it onto your existing

Read more »

New R User Group in Belgium

January 23, 2012
By

RBelgium is the latest local R user group to join the R community. Led by R user Jean-Baptiste Poullet, the group will host meetings on the first Friday of each month at the Alfot Hotel in Brussels, as well as weekly coffee get-togethers. The group also provides an on-line discussion forum on statistics and applications with R. You can...

Read more »

Flight mapping in R

January 23, 2012
By
Flight mapping in R

This map has been produced before (and much better) by others but who cares. This effort was achieved purely via the standard R plot function*. I believe the only departure from predecessor maps has been to order the list by … Continue reading →

Read more »

My first R package: parallel differential evolution

January 23, 2012
By
My first R package: parallel differential evolution

Last night I was working on a difficult optimization problems, using the wonderful DEoptim package for R. Unfortunately, the optimization was taking a long time, so I thought I'd speed it up using a foreach loop, which resulted in the fo...

Read more »

Marketing Mix Lab: Visualising The Correlation Matrix

January 23, 2012
By
Marketing Mix Lab: Visualising The Correlation Matrix

Following on from the previous post here is an R function for visualising correlations between the explanatory variables in your data set. An interesting example is the North Carolina Crime data set that comes with the plm package. This has the following continuous variables: crmrte crimes committed per person prbarr probability of arrest prbarr probability … Continue reading...

Read more »

The distribution of financial returns made simple

January 23, 2012
By
The distribution of financial returns made simple

Why returns have a stable distribution As “A tale of two returns” points out, the log return of a long period of time is the sum of the log returns of the shorter periods within the long period. The log return over a year is the sum of the daily log returns in the year.  … Continue reading...

Read more »

RNetLogo – A package for running NetLogo from R

January 23, 2012
By

Described in a new Methods in Ecology and Evolution paper here, a new R package RNetLogo allows you to use NetLogo from R. NetLogo is software is a "multi-agent programmable modeling environment". NetLogo can be used in individual- and agent-based mod...

Read more »

Starburst in R

January 22, 2012
By

> starburst('Matrices!') M M M a a a t t t rrr Matrices! ccc e e e s s s ! ! ! wrathematic led me FibBuzz, which led me to 

Read more »

Even odds

January 22, 2012
By
Even odds

This evening, I found a nice probabilistic puzzle on http://www.futilitycloset.com/ "A bag contains 16 billiard balls, some white and some black. You draw two balls at the same time. It is equally likely that the two will be the same color as diff...

Read more »

Sponsors

Mango solutions



plotly webpage

dominolab webpage



Zero Inflated Models and Generalized Linear Mixed Models with R

Quantide: statistical consulting and training

datasociety

http://www.eoda.de





ODSC

ODSC

CRC R books series





Six Sigma Online Training









Contact us if you wish to help support R-bloggers, and place your banner here.

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)