September 2011

Dollars and cents: How are you at estimating the total bill?

September 30, 2011 | 0 Comments

When estimating the cost of a bunch of purchases, a useful heuristic is rounding to the nearest dollar. (In fact, on US income tax returns, one is allowed to omit the cents). If prices were uniformly distributed, the following two heuristics would be equally accurate: * Rounding each item up or ... [Read more...]

Difficult Month for One of My Best Ideas

September 30, 2011 | 0 Comments

THIS IS NOT INVESTMENT ADVICE.  MY IDEAS PROBABLY WILL LOSE YOU MONEY, AND I WILL NOT LET YOU KNOW WHEN I CHANGE MY MIND. Bloomberg’s article “Asian Currencies Set for Worst Month Since 1997 Crisis Caused IMF Bailouts” demonstrates why with ...
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ttrTests This is a Test Test 3:Data Snoopy

September 30, 2011 | 0 Comments

THIS IS NOT INVESTMENT ADVICE.  IT IS JUST AN EXAMPLE AND WILL LIKELY LOSE LOTS OF MONEY IF YOU PURSUE WHAT IS DISCUSSED.  READER IS RESPONSIBLE FOR THEIR OWN GAINS OR LOSSES.  IF YOU ARE AN UNLIKELY WINNER, I WOULD LOVE TO HEAR YOUR STO...
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R 2.13.2 released

September 30, 2011 | 0 Comments

The R core team announced today that R 2.13.2 is now available: The byte pixies have rolled up R-2.13.2.tar.gz at 9:00 this morning. This is intended to be the final release of the 2.13 series, for the benefit of those apprehensive of putting 2.14.x into production use. This update fixes a ... [Read more...]

Rcpp 0.9.7

September 30, 2011 | 0 Comments

A fresh maintenance release version 0.9.7 of Rcpp went onto CRAN and into Debian earlier today. This release contains two contributed fixes. The first, suggested by Darren Cook via the rcpp-devel mailing list, corrects how we had set up excepti... [Read more...]

Microfinance Map of India – another go…

September 30, 2011 | 0 Comments

I gave it another go, trying to get a map that looks a bit nicer. This time, I tried to compute something like a density or intensity in a certain area. On the previous map, this was not visible very well. I used ggplot2 and a bit of R code, ... [Read more...]

R and Java – JRI Using Netbeans

September 30, 2011 | 0 Comments

Setting up R-Java in Netbeans is pretty straight forward. For those who need a walkthough here are the steps. Download and install R (for this example version 2.12.2). install rJava package.   Download and install Netbeans.  In Netbeans Create a new java project. we will call it RJava. /library/rJava/jri/examples ... [Read more...]

Monitoring Productivity II – the Others

September 30, 2011 | 0 Comments

In previous Monitoring Productivity Experiment post I looked into the hours I spent in computer, now will look into the hours Others spend in computer, which is far more interesting :) To find things like what day people spend more time on computer, ho... [Read more...]

Setting the initial view of a motion chart in R

September 30, 2011 | 0 Comments

Following on from my article about accessing and plotting World Bank data with R I want to talk about how to change the initial view of a motion chart.Over the last couple of weeks I have been asked a view times how to do this. For instance Stephen O'G...
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Customizing your .rprofile

September 29, 2011 | 0 Comments

I searched around to see if there was a blog post somewhere describing how to customize one’s .rprofile but was surprised to find just one outdated post. So here is quick intro on the topic. If you are a power R user, you already know about what it does. ... [Read more...]

Modelling with R: part 1

September 29, 2011 | 0 Comments

When I started work about 3 months ago, I didn't know much more than loading data and executing standard Econometric commands in R. But now I feel much much much more confident in using R for work, for research, for puzzles, and sometimes just for fun....
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Obama 2012 campaigning with analytics

September 29, 2011 | 0 Comments

The campaign to re-elect US president Barack Obama is hiring -- and the RDataMining blog noticed that several of the open positions seek R skills. If you want to be a Communications Analyst, Digital Strategy Analyst, or Statistical Modeling Analyst and you know R, there may be a job opening ... [Read more...]

Googling Bayes’ pictures

September 29, 2011 | 0 Comments

I am writing way too many posts in a row on Google tools. I promise I will think about something else soon. I find amusing the possibility to launch a search in Google images by just dragging a picture into … Continue reading → [Read more...]

A brief introduction to R for SAS and SPSS users

September 29, 2011 | 0 Comments

If you've used SAS or SPSS and want a jump-start into the basics of the popular R language, next week's webinar, Introduction to R for SAS and SPSS Users will be of interest to you. While R, SAS and SPSS are all three software systems for data analysis and graphics, ... [Read more...]

Connect JAVA to R part 2

September 29, 2011 | 0 Comments

To follow on from the earlier post on using R through Java, it is even easier to get jri up and running as a NetBeans module. Why is this useful? Well the platform that the NetBeans IDE is built on … Continue reading → [Read more...]

Paired sample t-test in R

September 28, 2011 | 0 Comments

Let’s walk through using R and Student’s t-test to compare paired sample data. The book Statistics: The Exploration & Analysis of Data (6th edition, p505) presents the longitudinal study “Bone mass is recovered from lactation to postweaning in adolescent mothers … Continue reading → [Read more...]

ttrTests This is a Test–Test 1 and Test 2

September 28, 2011 | 0 Comments

Just to remind everyone, THIS IS NOT INVESTMENT ADVICE AND ANY ACTIONS TAKEN BASED ON THIS DISCUSSION WILL PROBABLY RESULT IN SIGNIFICANT LOSSES. We had fun with the ttrTests package in two previous posts ttrTests: Its Great Thesis and Incredible Poten...
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Stuff Harvard People Like

September 28, 2011 | 0 Comments

What types of students go to which schools? There are, of course, the classic stereotypes: MIT has the hacker engineers. Stanford has the laid-back, social folks. Harvard has the prestigious leaders of the world. Berkeley has the activist hippies. Caltech has the hardcore science nerds. But how well do these ... [Read more...]
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