January 2010

Equivalents to SAS, SPSS modules in R

January 15, 2010 | David Smith

Bob Muenchen, the author of R for SAS and SPSS Users, has created a handy table listing the R packages that implement the statistical methods included in add-on modules for SAS and SPSS. For example, if you're looking for the equivalent structural equation modeling functions you might be using in ... [Read more...]

RQuantLib 0.3.2 released

January 14, 2010 | Thinking inside the box

A new version of RQuantLib (a package combining the quantitative analytics of QuantLib with the R statistical computing environment and language) is now out at CRAN and in Debian (where it depends on the 1.0.0 beta of QuantLib that is currently in t... [Read more...]

Typos in Chapters 6-7

January 14, 2010 | xi'an

Over the weekend and during the R exams, I managed to complete the solution set for Chapters 6 and 7 of “Introducing Monte Carlo Methods with R”. Chapter 6 only exhibited a few typos, despite me covering most exercises in Chapter 6, hence the merging of both chapters. – in Exercise 6.13, both and [...]
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Quick thoughts on “R-Powered Web Apps”

January 13, 2010 | David Smith

Good session at last nights Bay Area UseR Group meeting on R-Powered Web Apps. First of all, there's clearly a lot of interest in using R in Web-based applications: although the program was only announced a week ago, more than 100 people showed up for the talks from Jeff Horner and ... [Read more...]

Example 7.22: the Knapsack problem

January 13, 2010 | Nick Horton

The website http://rosettacode.org/wiki/Knapsack_Problem describes a fanciful trip by a traveler to Shangri La. They can take as many as they want of three valuable items, as long as they fit in a knapsack. The knapsack will hold no more than 25 weight units, and no more ...
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Making Maps with R

January 13, 2010 | James

***This tutorial has been updated, please click here*** I frequently use R (a free software environment for statistical computing and graphics) for data analysis.  As almost all my data are spatial it is often good to produce a map of the results without having to export the data into another ... [Read more...]

Rcpp 0.7.2

January 13, 2010 | romain francois

pre{ border: 1px solid black ; } Rcpp 0.7.2 is out, checkout Dirk's blog for details selected highlights from this new version: character vectors if one wants to mimic this R code in C __ x [Read more...]

Academics’ Slang: Orthogonal

January 12, 2010 | John Myles White

H. G. Wells famously said that, “statistical thinking will one day be as necessary for efficient citizenship as the ability to read and write.” I think we’re getting closer to that day: even the Supreme Court of the United States plan... [Read more...]

A new twist on the identifier mapping problem

January 11, 2010 | nsaunders

Yesterday, Deepak wrote about BridgeDB, a software package to deal with the “identifier mapping problem”. Put simply, biologists can name a biological entity in any way that they like, leading to multiple names for the same object. Easily solved, you might think, by choosing one identifier and sticking to it, ... [Read more...]

Typos in Chapter 5

January 11, 2010 | xi'an

After writing the solutions to the odd-numbered exercises in Chapter 5 of “Introducing Monte Carlo Methods with R”., I alas found the following typos, two of which are rather major (Exercise 5.3 and Example 5.16). I apologise to the readers these typos may confuse. – Exercise 5.3 has no simple encompassing set and the constraint ...
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R exams

January 11, 2010 | xi'an

As posted yesterday, today was the day of my Exploratory Statistics exam, turned into 3 R exams because of the lack of terminals for the students to work on. (We tried to encourage students to use their own laptop but less than twenty registered…) If you happen to be interested in ... [Read more...]

Bay Area User Group: R-Powered Web Apps

January 11, 2010 | David Smith

For those in the San Francisco area, tomorrow night's Bay Area R User Group meeting -- to be held at Twitter's HQ -- is a must-see. The theme is "R-Powered Web Apps" and features guest speakers Jeroen Ooms and Jeff Horner. (Disclosure: REvolution Computing is sponsoring Jeroen's appearance at this ... [Read more...]

LSPM with snow

January 10, 2010 | Joshua Ulrich

My last post provided examples of how to use the LSPM package. Those who experimented with the code have probably found that constrained optimizations with horizons __ 6 have long run-times (when calc.max __= horizon).This post will illustrate how the s...
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Outlawing Gay Marriage

January 10, 2010 | John Myles White

Given the recent votes on same-sex marriage in New Jersey and Portugal, I wanted to test a seemingly innocuous claim that touches upon very broad issues in political theory: does the degree of directness of a “democratic” vote predict whether the vote will promote or prohibit same-sex marriage? Naively, it ... [Read more...]

Pivot tables in R

January 9, 2010 | Chris

A common data-munging operation is to compute cross tabulations of measurements by categories. SQL Server and Excel have a nice feature called pivot tables for this purpose. Here we'll figure out how to do pivot operations in R.Let's imagine an experim...
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