Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 This guest post from Anand Srinivasan compares performance of the Oracle R Connector for Hadoop with the R {parallel} package for covariance matrix computation, sampling, and parallel linear model fitting.  Oracle R Connector for Hadoop (ORCH) is a collection of R packages ... [Read more...]

Nowadays, routinary operations on files, such as renaming or copying, are performed with some mouse clicks. Sometimes, it is useful perform this operations in batch. Linux users perform this operations through the shell. Also Windows users can use the shell, … Continue reading → [Read more...]

While developing our agop package I encountered some problems with calling S4 generic functions defined in the Matrix package, that were created from “base” S3 generics. I don’t know whether it’s an R bug (tested in R 2.15 and R…Read more › [Read more...]

The recent elections in Pakistan on May 11 were a great success by all means. In spite of the threats for violence by Al-Qaeda and its local franchises in Pakistan against those who would vote, millions of Pakistanis indeed stepped out to vote for an elected government. The Election Commission of ... [Read more...]

# As a homage to Yitang Zhang who has proven a mind-bending property of Prime Pairs, I have written a prime Sieve to detect all of the prime numbers from 1 to N. # There might very well be a function in the base package that already does this. No... [Read more...]

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In this post I show some R-examples on how to perform power analyses for mixed-design ANOVAs. The first example is analytical—and adapted from formulas used in G*Power (Faul et al., 2007), and the second example is a Monte Carlo simulation. Read more [Read more...]

The OpenData StackExchange site has just launched in beta, and looks to be a great resource for open data sources. Like StackOverflow for programming and CrossValidated for statistics, OpenData is is a question and answer site for developers and researchers interested in open data. There's no R tag yet (though ... [Read more...]

[caption id="attachment_734" align="aligncenter" width="500"] An alternative bezier arrow to the regular grid-bezier. Apart from a cool gradient it has the advantages of: exact width, exact start/end points and axis alignment.[/caption] About two weeks ago I got frustrated with the bezierGrob function in the grid package. The ... [Read more...]

Spatial correlograms are great to examine patterns of spatial autocorrelation in your data or model residuals. They show how correlated are pairs of spatial observations when you increase the distance (lag) between them - they are plots of some index…Read more → [Read more...]

Pivot tables are a a growing staple for analysis in excel yet they remain limited to the functionality which Microsoft has chosen to include. Typical operations are the inclusion of filters, choice over rows, columns, and maths operations. In R … Continue reading → [Read more...]

Quite often I have long procedures running and want to do this over night. However, my computer would still be running all night after the script has finished. This is easily circumvented by the following lines that I put at the end of such a script:# set working dir# setwd("... [Read more...]

I am going to be using the party package for one of my projects, so I spent some time today familiarising myself with it. The details of the package are described in Hothorn, T., Hornik, K., & Zeileis, A. (1999). “party: A Laboratory for Recursive Partytioning” which is available from CRAN. The ... [Read more...]

I often want to quickly create a lag or lead variable in an R data frame. Sometimes I also want to create the lag or lead variable for different groups in a data frame, for example, if I want to lag GDP for each country in a data frame. I've ... [Read more...]

The steps taken to fix an R problem. Task To prepare for the Portfolio Probe blog post called “Implied alpha and minimum variance”, I tried to update a matrix of daily stock prices using a function I had written for the purpose. Error When I tried to do what I ... [Read more...]

This R function uses the free freegeoip.net geocoding service to resolve an IP address (or a vector of them) into country, region, city, zip, latitude, longitude, area and metro codes. Continue reading → [Read more...]

So when the world is taken over by a Zombie horde, you're going to want to figure out a way to get the human population to safety. This R script by econometrician Francis Smart won't help you do that exactly, but given a list of waypoints to navigate through zombie-infested ... [Read more...]

[This article was first published on Enterprise Software Doesn't Have to Suck, and kindly contributed to R-bloggers]. (You can report issue about the content on this page [Read more...]

I have just released my first complete test of non-verbal problem solving skills.  It is run on Concerto (an R-based application development platform targeted at primarily test developers)  Try it out by following the link below.Non-Verbal Re... [Read more...]

R 3.0.1 (codename “Good Sport”) was released last week. As mentioned earlier by David, this version improves serialization performance with big objects, improves reliability for parallel programming and fixes a few minor bugs. Upgrading to R 3.0.1 You can download …Read more » [Read more...]