October 2011

Do cents follow Benford’s Law?

October 5, 2011 | dan

Benford's law is an amazing thing. If you know the probability distribution that classes of "natural" numbers should have, you can detect where people might be faking data: phony tax returns, bogus scientific studies, etc. [Read more...]

Linear regression with correlated data

October 5, 2011 | Luis

I started following the debate on differential minimum wage for youth (15-19 year old) and adults in New Zealand. Eric Crampton has written a nice series of blog posts, making the data from Statistics New Zealand available. I will use … Continue reading → [Read more...]

Calling Google Maps API from R

October 5, 2011 | Pierre Jacob

Hi, Related to Julyan’s previous post, I want to share an easy way to access Google Maps API through R. And then we’ll stop about Google, otherwise it’ll look like we’re just looking for jobs. My problem was the following: … Continue reading → [Read more...]

New release with Batch processing

October 5, 2011 | Markus (cloudnumbers.com)

This week we rolled out a new release at cloudnumbers.com which implements two new main features: cloudnumbers.com now supports Batch processing. Due to some changes in the architecture we were able to reduce our system requirements. In detail, we do not need that much open ports in your ... [Read more...]

Modelling with R: part 3

October 5, 2011 | MK

The previous posts, part 1 and part 2, detailed the procedure to successfully import the data and transform the data so that we can extract some useful information from them. Now it's time to get our hands dirty with some predictive modelling. The dependent variable here is a binary variable taking values "0" ... [Read more...]

Drawing maps using shapefiles and R

October 4, 2011 | Daniel

Sometimes a student may use a self explained chart, instead of a boring table for showing outcomes in a research paper. Yet, graphs are efficient in showing the broad picture of an issue and also for present results. In political science, you can getting into this topic reading Kastellec and ... [Read more...]

Interactive charts with googleVis package and R

October 4, 2011 | Yanchang Zhao

Examples at the link below illustrate interactive charts created with the googleVis package and R. http://code.google.com/p/google-motion-charts-with-r/wiki/GadgetExamples Some amazing features are: a motion chart shows the changes over time, an AnnotatedTimeLine shows zoom-in/zoom-out view of time series, a TreeMap supports drill-down … Continue reading → [Read more...]

GEE using Stata vs. R

October 4, 2011 | Shige

I am running GEE logistic regression model for my fetal loss paper. As usual, I compare results between Stata and R and make sure they are consistent. To my surprise, the models assuming independent correlation structure give similar results but the mo... [Read more...]

Bayesian Computation with R – Albert (2009)

October 4, 2011 | bryan

Title: Bayesian Computation with RAuthor(s): Jim AlbertPublisher/Date: Springer/2009Statistics level: High Programming level: Low Overall recommendation: Recommended Bayesian Computation with R focuses primarily on providing the reader with a basic understanding of Bayesian thinking and the relevant analytic tools included in R. It does not explore either of ... [Read more...]

Bayesian Computation with R – Albert (2009)

October 4, 2011 | bryan

Title: Bayesian Computation with RAuthor(s): Jim AlbertPublisher/Date: Springer/2009Statistics level: High Programming level: Low Overall recommendation: Recommended Bayesian Computation with R focuses primarily on providing the reader with a basic un... [Read more...]

permute: a package for generating restricted permutations

October 4, 2011 | ucfagls

Multivariate ordination methods are commonly used in ecology to investigate patterns in species composition in space or time. Constrained ordination methods such as redundancy analysis (RDA) and canonical correspondence analysis (CCA) are effectively just multiple regressions, but we lack the … Continue reading → [Read more...]

Tutorial on using the rworldmap package

October 4, 2011 | xingmowang

This blog following up my previous oneattempts to explain how the geo-pie map was created. I do not know how to attach a .rflow file in this blog. What you can do is to copy the following code into Notepad … Continue reading → [Read more...]

How to show explained variance in a multilevel model

October 3, 2011 | Daniel

In this post I will show one way to display explained variance using a line chart. There is no default plot for displaying the effect of each factor on deviance of the model, so this is a tentative proposal for my dissertation. The following values were obtained using multilevel models ... [Read more...]
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