2900 search results for "twitteR"

The R-Podcast Episode 4: Data Structures-Introduction

March 25, 2012
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In this episode: Site updates, additional screencasts about R from other sites, listener feedback, and discussion on the fundamental data structures for R: vectors, matrices, lists, and data frames. The R code discussed in this episode is available in our GitHub repository, see the show notes for details. Leave us a voicemail a +1-269-849-9780, or

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The R-Podcast Episode 4: Data Structures-Introduction

March 25, 2012
By

In this episode: Site updates, additional screencasts about R from other sites, listener feedback, and discussion on the fundamental data structures for R: vectors, matrices, lists, and data frames. The R code discussed in this episode is available in ...

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Initial release 0.1.0 of package RcppSMC

March 24, 2012
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Initial release 0.1.0 of package RcppSMC

Hm, I realized that I announced this on Google+ (via Rcpp) as well as on Twitter, on the r-packages list, wrote a new and simple web page for it, but had not put it on my blog. So here is some catching up. Sequential Monte Carlo / Particle Filter is ...

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R script to calculate QIC for Generalized Estimating Equation (GEE) Model Selection

March 23, 2012
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R script to calculate QIC for Generalized Estimating Equation (GEE) Model Selection

Generalized Estimating Equations (GEE) can be used to analyze longitudinal count data; that is, repeated counts taken from the same subject or site. This is often referred to as repeated measures data, but longitudinal data often has more repeated observations. … Continue reading →

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Gini Efficient Frontier

March 23, 2012
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Gini Efficient Frontier

David Varadi have recently wrote two posts about Gini Coefficient: I Dream of Gini, and Mean-Gini Optimization. I want to show how to use Gini risk measure to construct efficient frontier and compare it with alternative risk measures I discussed previously. I will use Gini mean difference risk measure – the mean of the difference

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Do we appreciate sunbathing in Spring ?

March 22, 2012
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Do we appreciate sunbathing in Spring ?

We are currently experiencing an extremely hot month in Montréal (and more generally in North America). Looking at people having a beer, and starting the first barbecue of the year, I was wondering: if we asked people if global warming was a good ...

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Montreal R Workshop: Introduction to Bayesian Methods

March 22, 2012
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Montreal R Workshop: Introduction to Bayesian Methods

Monday, March 26, 2012  14h-16h, Stewart Biology N4/17 Corey Chivers, Department of Biology McGill University This is a meetup of the Montreal R User Group. Be sure to join the group and RSVP. More information about the workshop here. Topics Why would we want to be Bayesian in the first place?  In this workshop we

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Metadata Dubuque and UHI

March 21, 2012
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Metadata Dubuque and UHI

I’m in the process of remaking all the metadata from scratch and looking once again at the question of UHI. There are not any global conclusions we can draw from the data yet; I’m just in the process of checking out everything that is available that could be used to illuminate the problem. The problem,

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Simple ROC plots with ggplot2 – Part 2

March 21, 2012
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Simple ROC plots with ggplot2 – Part 2

In the first part of this article we built a function (rocdata) to calculate the co-ordinates for the ROC plot and its summary statistics. Now we need to actually produce the plot. I make most of my plots in ggplot2 because of it’s versatility. However there’s no reason why these plots couldn’t be produced

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Simple ROC plots with ggplot2 – Part 1

March 21, 2012
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Simple ROC plots with ggplot2 – Part 1

I was recently asked to summarise an analysis using a ROC (Receiver-operator characteristics) plot. R has a number of particularly good tools to produce ROC plots – ROCR, pROC and the Bioconductor package ROC to name a few. However I thought it would be a useful exercise

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