2800 search results for "Twitter"

R gotcha for the week

March 15, 2012
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R gotcha for the week

I use the biomaRt package from Bioconductor in almost every R session. So I thought I’d load the library and set up a mart instance in my ~/.Rprofile: On starting R, I was somewhat perplexed to see this error message: Twitter to the rescue. @hadleywickham told me to load utils first and @vsbuffalo explained that

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New R User Group in Montreal

March 15, 2012
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New R User Group in Montreal

The Montreal R User Group is now official. You can join the group by visiting the meetup site. The group has existed since 2010 in a narrower incarnation as the BGSA R/Stats Workshop Series. Previous workshops have featured invited facilitators on topics such as Causal Analysis, GLMs, GAMs, Multi-model inference, Phylogenetic analysis, Bayesian modeling, Meta-analysis,

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Call for chapters: Data Mining Applications with R

March 15, 2012
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Call for chapters: Data Mining Applications with R

Data Mining Applications with R A book to be published by Elsevier http://www.RDataMining.com/books/book2 Proposal Submission Deadline: April 30, 2012 Introduction R is one of the most widely used data mining tools in scientific and business applications, among dozens of commercial … Continue reading →

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Portfolio Optimization: Specify constraints with GNU MathProg language

March 14, 2012
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Portfolio Optimization: Specify constraints with GNU MathProg language

I have previously described a few examples of portfolio construction: Introduction to Asset Allocation Maximum Loss and Mean-Absolute Deviation risk measures 130/30 Portfolio Construction Minimum Investment and Number of Assets Portfolio Cardinality Constraints Multiple Factor Model – Building 130/30 Index (Update) I created a number of helper functions to simplify process of making the constraints(

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π Day Special! Estimating π using Monte Carlo

March 14, 2012
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π Day Special! Estimating π using Monte Carlo

In honour of π day (03.14 – can’t wait until 2015~) , I thought I’d share this little script I wrote a while back for an introductory lesson I gave on using Monte Carlo methods for integration. The concept is simple – we can estimate the area of an object which is inside another object

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Visualising F1 Telemetry Data and Plotting Latitude and Longitude with ggplot Map Projections in R

March 14, 2012
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Visualising F1 Telemetry Data and Plotting Latitude and Longitude with ggplot Map Projections in R

Why don’t X-Y plots of latitude and longitude data look “right” compared to traditional map views? For example, here’s an X-Y scatterplot of some of Jenson Button’s McLaren telemetry data from the 2010 Australian Formula One Grand Prix: The image was generated, from a data file hosted on Google Spreadsheets, using the following R script,

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Simple plots reveal interesting artifacts

March 14, 2012
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Simple plots reveal interesting artifacts

I’ve recently been working with methylation data; specifically, from the Illumina Infinium HumanMethylation450 bead chip. It’s a rather complex array which uses two types of probes to determine the methylation state of DNA at ~ 485 000 sites in the genome. The Bioconductor project has risen to the challenge with a (somewhat bewildering) variety of

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More Anthromes !

March 13, 2012
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More Anthromes !

First off let me thank folks for all the comments and suggestions. I’m just starting to explore this data so perhaps I should explain how I go about  doing this. First off, I am looking for a global bias in the record from UHI. It is well known that you can look through the data

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In case you missed it: February Roundup

March 13, 2012
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In case you missed them, here are some articles from February of particular interest to R users. February 29 marked the 12th anniversary of the release of R 1.0.0, and the release of R 2.14.2. A list of commercial vendors who have integrated R with their products for data, analysis, and presentation. The rmr package (part of the RHadoop...

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Anthromes and UHI

March 12, 2012
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Anthromes and UHI

With BerkeleyEarth 1.6 posted to CRAN I figured it was time to do some sample programs to explain how the package worked and integrated with other packages. Also, I have some issues to check out with the metadata; and in the long run I want to reformulate my metadata package to include some new resources.

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