February 2009

Plotting PDQ Output with R

February 27, 2009 | 0 Comments

One the nice things about PDQ-R (coming in release 5.0) is the ability to plot PDQ output directly in R. Here's a PDQ-R script, together with the corresponding graphical output, that I knocked up to show the effect on the throughput curve of adding mor...
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R in The Windy City

February 27, 2009 | 0 Comments

In honor of me moving to Chicago, the powers who abide have decided to hold the first annual “R/Finance conference for applied finance using R” conference in Chicago this year. The dates are April 24-25, 2009. R/Finance 2009: Applied Finance with R To those who made the decision on location, ... [Read more...]

Data Analysis Workflow… Part 1 of Infinity

February 26, 2009 | 0 Comments

One of the many things that I sit around pondering when I should be doing productive things is the idea of analytical workflow. I have only worked with one analytical guru who I felt really gave thought and structure to workflow and its impact on analyist productivity. When I talk ... [Read more...]

Absolutely great resource

February 25, 2009 | 0 Comments

A very nice resource which helped me a lot in kickstarting my Sweave efforts is Learning to Sweave in APA Style by clementi on scribd. This is a down to earth tutorial containing a lot of good tips! See for yourself:Learning to Sweave in APA Style ... [Read more...]

R/Finance conference in Chicago in April: Registration now open

February 23, 2009 | 0 Comments

Regarding the aforementioned R/Finance conference that will take place at the end of April here in Chicago, we announced earlier today that the conference website is now available. It provides information about the program, speakers and other details as well as a link to registration details. See you in ... [Read more...]

Sorry, you said you want a stats revolution?

February 23, 2009 | 0 Comments

ALL ABOUT REVOLUTION COMPUTING’S R DISTRIBUTION Decision Science News was intrigued by a company called REvolution Computing that got some attention of late for spinning their own mix of the R language for statistical computing and giving it away for free. So DSN asked to interview them to see ...
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Project Euler Problem #15

February 22, 2009 | 0 Comments

Problem 15 on Project Euler asks us to find the number of distinct routes between the top left and bottom right corners in a 20×20 grid, with no backtracking allowed. I originally saw this type of problem tackled in the book Notes On Introductory ... [Read more...]

PDQ-R Lives!

February 22, 2009 | 0 Comments

After some fiddling to get things linked correctly to the R binaries on my new Macbook, the first PDQ-R test model has run successfully! Here 'tiz ...This is an important step for PDQ development and is due entirely to the efforts of Phil Feller. Natur...
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R graphics: margins are way to large

February 22, 2009 | 0 Comments

For me R has a very nice and powerfull capabilities for graphics (for example see this gallery). However, I dislike the default setting for margins and placement of axis numbers and labels. Since I always forget the setting of parameters I prefer I am adding this post. For example: library(... [Read more...]

Project Euler Problem #13

February 21, 2009 | 0 Comments

Problem 13 on Project Euler asks us to sum 100 50-digit numbers and give the first 10 digits of the result. This is pretty easy. Note we are using R’s integer division operator %/% to discard the remainder of the large summed integer and just giv... [Read more...]

Project Euler Problem #14

February 21, 2009 | 0 Comments

Problem 14 on the Project Euler site asks us to find the longest chain under 1 million created using the Collatz mapping. This is fairly straightforward, although performance again is not great: ## Problem 14 # Collatz conjecture problem14  [Read more...]

Project Euler Problem #12

February 21, 2009 | 0 Comments

Problem 12 on the Project Euler site asks: What is the value of the first triangle number to have over five hundred divisors? A triangular number T(n) is defined as . The R code below consists of a solution, which involves the fact that the number of proper divisors of an ... [Read more...]

People who love scatter plots & connecting dots

February 20, 2009 | 0 Comments

We hosted the first Dataviz Salon SF on Tuesday night, with lightning talks by boredom cop Shane Booth, dataviz wiz Lee Byron , computational journalist Brad Stenger, data wrangler Pete Skomoroch , and any/all data enthusiast Brendan O’Connor . I was going to blog all about it — but Tom Carden of ... [Read more...]

R: Good practice – adding footnotes to graphics

February 17, 2009 | 0 Comments

In some statistical programs there is the option available to attach a footnote to the graphical output that is created. This footnote may contain the name of the script or the file that produced the graphic, the author’s name and the date of creation. In SAS for example there ...
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Pearson vs. Spearman Correlation Coefficients

February 17, 2009 | 0 Comments

One of the misuses of statistical terminology that annoys me most is the use of the word “correlation” to describe any variable that increases as another variable increases. This monotonic trend seems worth looking for, but it plainly is not what m...
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TTR_0.2 on CRAN

February 15, 2009 | 0 Comments

I am happy to announce a long-overdue update to the TTR package (version 0.2) is now on CRAN.This update represents a major milestone, as TTR useRs are no longer restricted to using matrix objects. TTR 0.2 uses xts internally, so all major time series...
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