by James Paul Peruvankal, Senior Program Manager at Revolution Analytics Three weeks ago, researchers at Princeton released a study on Epidemiological modeling of online social network dynamics that states Facebook might lose 80% of its users by 2015-2017. Facebook data scientists hilariously debunked the study stating that Princeton itself would lose ... [Read more...]

Dear R users, R-bloggers is (hopefully) back online! I wanted to update you that in the past two days, the site has been subject to unreasonable amount of traffic (probably [Read more...]

Our project team is aimed at providing data analysis to the rest of the company to make data-driven decisions. We faced a problem when we discovered that the Excel solver was not able to solve some “large” problem. So we switched to R and our first tests are quite encouraging. ... [Read more...]

Data on more than 10,000 species of ants recorded worldwide are available through from California Academy of Sciences' AntWeb, a repository that boasts a wealth of natural history data, digital images, and specimen records on ant species from a large community of museum curators. Digging through some of the earliest announcements ... [Read more...]

Ramnath design rCharts wich combine the powerful of open source R and D3.js.It give very pretty plots. Here is some code, using package XML to collect the data from http://www.sochi2014.com/fr/classement-des-medailles and plot a kind of sankey diagram ... [Read more...]

The other day I had data that showed the development of many products over time. I grouped the products into categories and visualised the data as line graphs in lattice. But instead of adding an extensive legend to the plot I wanted to add labels to each line's latest point. ... [Read more...]

The Impact You’ll Have at RP The Analytics group strives to provide actionable data analysis for Return Path departments to make data-driven decisions. The Data Analyst will collaborate with statisticians, engineering teams, product management, marketing, and others to support existing products and develop new products. The Return Path Network ... [Read more...]

Conditioning and grouping are two important concepts in graphing that allow us to rapidly refine our understanding of data under consideration. Conditioning, in particular, allows us to view relationships across “panels” with common scales. Each panel contains a plot whose data is “conditional” upon records drawn from the category that ... [Read more...]

I recently had the pleasure in participating in the 2014 WCMC Statistics for Metabolomics Short Course. The course was hosted by the NIH West Coast Metabolomics Center and focused on statistical and multivariate strategies for metabolomic data analysis. A variety of topics were covered using 8 hands on tutorials which focused on: ... [Read more...]

A few months ago, I saw a link on twitter to an awesome graph charting the similarities of different foods based on their flavour compounds, in addition to their prevalence in recipes (see the whole study, The Flavor Network and the … Continue reading → [Read more...]

If you missed our recent webinar Creating Value that Scales, you missed out on a live demonstration of the big-data analytics of Revolution R Enterprise embedded in the drag-and-drop visual workflow interface of Alteryx. If you want to see how a decision-maker can use the results of workflows created by ... [Read more...]

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

Haley Marketing Group, the staffing industry’s leading marketing services firm, is seeking experienced IT bloggers to write about the IT industry and IT workforce management. You can work your own schedule, as long as you: write and edit original content that adheres to blogging best practices; meet all project ... [Read more...]

The Spring Festival is the most important holiday in China and many other Asian countries. Traditionally, the holiday starts on Chinese New Year’s Eve, and lasts to the Lantern Festival on the 15th day of the first month of the lunisolar calendar. The Chinese New Year is celebrated either ... [Read more...]

This posting shows how one might perform demodulation in R. It is assumed that readers are generally familiar tith the procedure. First, create some fake data, a carrier signal with period 10, modulated over a long timescale, and with phase drifting linearly over time.

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rgbif is an R package to search and retrieve data from the Global Biodiverity Information Facilty (GBIF). rgbif wraps R code around the [GBIF API][gbifapi] to allow you to talk to GBIF from R. We just pushed a new verion of rgbif to cran - v0.5.0. Source and binary ... [Read more...]

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David Varadi has recently discussed an interesting strategy in the Are Simple Momentum Strategies Too Dumb? Introducing Probabilistic Momentum post. David also provided the Probabilistic Momentum Spreadsheet if you are interested in doing computations in Excel. Today I want to show how you can test such strategy using the Systematic ... [Read more...]

Hey everybody, this is just a short post but I found it very useful. I want to show you how to add images as a background to your ggplot2 plots. To do so we need the packages png and grid Btw, this is just a cool and fast way to ... [Read more...]

Continue to discuss this topic about multicollinearity in regression. Firstly, it is necessary introduce how to calculate the VIF and condition number via software such as R. Of course it is really easy for us. The vif() in car and kappa() can be applied to calculate the VIF and condition ... [Read more...]