September 2012

Network of trade

September 22, 2012 | Michael kao

This week,  I got my hands on some agricultural trade data. Trade data are typically extremely dirty so treat with care when you get your hands on them. Lab standard equipments are required.So I decided to look how countries trade by plotting the ... [Read more...]

PLS2 with "R"

September 22, 2012 | jrcuesta

I´ve been working these days with PLS2 calibrations with a chemometric software called “Unscrambler” with a data set called “jam”. I said “can I develop PLS2 models with R?”.I look in the book “Introduction to Multivariate Statistical An...
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Power Analysis and the Probability of Errors

September 22, 2012 | Wesley

Power analysis is a very useful tool to estimate the statistical power from a study. It effectively allows a researcher to determine the needed sample size in order to obtained the required statistical power. Clients often ask (and rightfully so) what the sample size should be for a proposed project. ... [Read more...]

Federal Register API/R Package Ideas?

September 21, 2012 | Christopher Gandrud

The other day Critical Juncture put up an API for the Federal Register. I thought it would be great if there was a package that could use this API to download data directly into R (much like the excellent WDI package). This would make it easier to anal... [Read more...]

Minimum Correlation Algorithm Paper

September 21, 2012 | systematicinvestor

Over summer I was busy collaborating with David Varadi on the Minimum Correlation Algorithm paper. Today I want to share the results of our collaboration: Minimum Correlation Algorithm Paper Back Test reports Supporting R code The Minimum Correlation Algorithm is fast, robust, and easy to implement. Please add it to ... [Read more...]

MCMSki IV, Jan. 6-8, 2014, Chamonix (news #1)

September 21, 2012 | xi'an

As advertised on the ‘Og, the ISBA mailing list and now the birth certificate of BayesComp (!), MCMSki IV is taking place for sure in Chamonix-Mont-Blanc, January 6-8 2014. The webpage has been started, thanks to Merrill Liechty, and should grow with informations about the location, the hotels, registration, transportation, and of ... [Read more...]

Bivariate normal distribution with R

September 21, 2012 | édouard

Exercise: Plot a bivariate normal distribution for simulated data, , and . As explained on Mathworld, the bivariate normal distribution is the statistical distribution with probability density function: where: and, with ‘real’ data: Here, we will impose . We are free to … Continue reading → [Read more...]

rjags Updated and Numbering Corrected

September 21, 2012 | The Ubuntu R Blog

On September 18th, Martyn Plummer updated rjags. Normally, this wouldn't be a big deal, but a question came across the R-sig-debian mailing list about the package at the same time, and I noticed that my Ubuntu 12.04 (precise) machine was using version... [Read more...]

Religious restrictions index: how do countries compare?

September 21, 2012 | David Ruau

The Guardian DataBlog published yesterday an interesting article exploring graphically the religious intolerance across the world. The data are coming from a report published by Pew Research Center's Forum on Religion and Public Life. I like the philosophy DataBlog a lot, providing the raw data for everyone to look at. ... [Read more...]

A video map of the hottest songs in the US

September 21, 2012 | Luba Gloukhov

Today's guest post comes from Revolution Analytics data scientist Luba Gloukhov — ed. As a big fan of R’s ever-expanding geospatial plotting capabilities, I jumped at the chance create a map using The Million Song Dataset (MSD). For each of the 10,000 songs in the million song subset containing non-missing latitudes & ... [Read more...]

ProbaPerception: Introduction

September 21, 2012 | Edwin Grappin

Hello (New World!),  My name is Edwin, I’m a 22 year-old French student in applied mathematics. In particular, I study probability, statistics and risk theory. We learn interesting things but there is still one question I feel stupid about: Is statistics, actually, useful? I mean not theoretically but in the ... [Read more...]

Plotting Watts-Strogatz model

September 21, 2012 | Bogumił Kamiński

Recently I wanted to reproduce Figure 2 from Watts and Strogatz (1998). The task using igraph is simple but an interesting task was annotation of the resulting plot.Watts-Strogatz model generates graphs that have so called small-world ne... [Read more...]

Simple plot with text boxes

September 21, 2012 | nzcoops

Was doing a little presentation to our research group and had to explain the difficulties of ‘collapsing’ longitudinal data into a single measure when the Y var is quite variable. For the particular Y var of interest, it represents burden … Continue reading → [Read more...]

BARUG Meetup at the Googleplex

September 21, 2012 | Stephanie Taylor

What is R?  R is an open-source, statistical programming language that is increasingly becoming the lingua franca of modern data analysis. R developers have created over 4,000 packages to run in the R environment, including several dozen developed by Googlers. We continue to work with the R community through conferences, meetups ... [Read more...]

Interactive 3d plot, in R

September 20, 2012 | arthur charpentier

Following the course of this afternoon, I will just upload some codes to make interactive 3d plots, in R. __ library(rgl) __ library(evd); __ data(lossalae) __ U=rank(lossalae[,1]+rnorm(nrow(lossalae), + mean=0,sd=.001))/(nrow(lossalae)+1) ... [Read more...]

Obviousness of REITs?

September 20, 2012 | klr

I very much enjoy papers such as Antonacci, Gary, Risk Premia Harvesting Through Momentum (September 5, 2012). Available at SSRN: http://ssrn.com/abstract=2042750 or http://dx.doi.org/10.2139/ssrn.2042750 Faber, Mebane T., A Quantitative Approach to T...
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Descriptive Statistics of Groups in R

September 20, 2012 | Mollie

The sleep data set—provided by the datasets package—shows the effects of two different drugs on ten patients. Extra is the increase in hours of sleep; group is the drug given, 1 or 2; and ID is the patient ID, 1 to 10.I'll be using this data set to show how to ... [Read more...]
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