January 2011

Introductory R Books

January 31, 2011 | Daniel Hocking

Here's a link to another blog compiling information and recommendations are introductory books on R (not statistics books that use R).  I thought this might be useful for people.http://csgillespie.wordpress.com/2011/01/28/r-programming-books-updated/
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Tricks to manage memory in an R session

January 31, 2011 | David Smith

Unless you're using an out-of-memory solution to manage large data objects (such as the RevoScaleR package in Revolution R Enterprise), then R always allocates memory for every object in your working session. If you're working with many objects (or even just a few large objects) then you'll need to take ... [Read more...]

Tick data retrieval

January 31, 2011 | Dzidorius Martinaitis

I just published Java based code to pull tick data from Interactive Brokers. There are thousands tools to get tick data from IB, but I had one feature in mind. You can get maximum 50 quotes per second from Interactive Brokers (its IB limitation for TWS API) . Imagine a situation, when ... [Read more...]


January 31, 2011 | Malarkey

I have just discovered yet another public data site www.datamarket.com. Most of the data are time-series. It collects together things like World bank, Eurostat, Gapminder into the one place. It also allows you to download data as csv files or to creat... [Read more...]

A gentle introduction to R

January 31, 2011 | Stubborn Mule

Whenever a post on this blog requires some data analysis and perhaps a chart or two, my tool of choice is the versatile statistical programming package R. Developed as an open-source implementation of an engine for the S programming language, R is therefore free. Since commercial mathematical packages can costs ...
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Good riddance to Excel pivot tables

January 30, 2011 | Scott Chamberlain

Excel pivot tables have been how I have reorganized data...up until now. These are just a couple of examples why R is superior to Excel for reorganizing data:################ Good riddance to pivot tables ############library(reshape2)library(plyr)&nbsp...
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ABC model choice not to be trusted [3]

January 30, 2011 | xi'an

On Friday, I received a nice but embarrassing email from Xavier Didelot. He indeed reminded me that I attended the talk he gave at the model choice workshop in Warwick last May, as, unfortunately but rather unsurprisingly giving my short span memory!, I had forgotten about it! Looking at the ...
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Code: parsing Slovenian exchange rate data

January 30, 2011 | Jason

Some time ago I found myself in need of daily exchange rates for the Slovenian Tolar (though I can’t now remember why). Unfortunately, I wasn’t able to find the data in a readily usable format at the Bank of Slovenia … Continue reading → [Read more...]

Data Mining with WEKA

January 30, 2011 | Ralph

There are a number of good open source projects for statistics and data mining, for example the software WEKA developed at the University of Waikato. The description on their website states that: Weka is a collection of machine learning algorithms for data mining tasks. The algorithms can either be applied ... [Read more...]

Statistical Computing and Graphics Newsletter

January 30, 2011 | martin

The new issue (Vol. 21, No. 2) is out now. Featured articles are: barNest: Illustrating nested summary measures by Jim Lemon and Ofir Levy You say “graph invariant,” I say “test statistic” by Carey E. Priebe, Glen A. Coppersmith and Andrey Rukhin Computation in Large-Scale Scientific and Internet Data Applications is a ... [Read more...]

Tab completion

January 30, 2011 | Ari F.

Let's say your hands are aching from too much typing in of variables. What to do? Get a keyboard tray and learn proper ergonomics, of course.But what if you just want to reduce the amount of typing in of variables you do for reasons of laziness...err... [Read more...]

R exam

January 30, 2011 | xi'an

I spent most of my Saturday perusing R codes to check the answers written by my students to the R exam I gave two weeks ago… The outcome is mostly poor, even though some managed to solve a fair part of the long problem. Except for the few hopeless cases ... [Read more...]

R programming books (updated)

January 28, 2011 | csgillespie

In a recent post, I asked for suggestions for introductory R computing books. In particular, I was looking for books that: Assume no prior knowledge of programming. Assume very little knowledge of statistics. For example, no regression. Are cheap, since they are for undergraduate students. Some of my cons aren’... [Read more...]

Converting strsplit() output to a data.frame

January 28, 2011 | Gregor Gorjanc

R has a nice set of utilities to work with strings. Function paste is surely one among these. It can be used to "glue" several strings with optional separator. The following example shows how paste can be used to create a new variable in a dataset: dat (dat$z Today ... [Read more...]

Homicides in Mexico 2006-2009

January 27, 2011 | Diego Valle-Jones

Just today the Mexican government released to the public the mortality database for 2009, and as you can see from the chart Mexico has suffered from a steep rise in homicides from 2008 onward and very likely reached the highest violence rate in recent history last year. Since the Mexican government also ... [Read more...]

ABC model choice not to be trusted [2]

January 27, 2011 | xi'an

As we were completing our arXiv summary about ABC model choice, we were helpfully pointed to a recent CRiSM tech. report by X. Didelot, R. Everitt, A. Johansen and D. Lawson on  Likelihood-free estimation of model evidence. This paper is quite related to our study of the performances of the ...
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