Monthly Archives: June 2013

Bulk search for domain names using R

June 8, 2013
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# There are several domain name servers that allow # for bulk searching of domain names.# http://www.godaddy.com/bulk-domain-search.aspx# http://www.namestation.com/bulk-domain-search# However, they do not provide any wildcard support # and instead exp...

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Matrix Operations

June 8, 2013
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Matrix manipulation in R are very useful in Linear Algebra. Below are lists of common yet important functions in dealing operations with matrices:Transpose - tMultiplication - %*%Determinant - detInverse - solve, or ginv of MASS libraryEigenvalues and ...

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R and MongoDB

June 7, 2013
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R and MongoDB

MongoDB is a document-based noSQL database. Different from the relational database storing data in tables with rigid schemas, MongoDB stores data in documents with dynamic schemas. In the demonstration below, I am going to show how to extract data from a MongoDB with R. Before starting the R session, we need to install the MongoDB

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Hey, I Just did a Significance Test!

June 7, 2013
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Hey, I Just did a Significance Test!

I’ve seen it happens quite often. The sig test. Somebody simply needs to know the p-value and that one number will provide all of the information about the study that they need to know. The dataset is presented and the client/boss/colleague/etc invariably asks the question “is it significant?” and “what’s the correlation?”. To quote R.A.

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Robust logistic regression

June 7, 2013
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Corey Yanofsky writes: In your work, you’ve robustificated logistic regression by having the logit function saturate at, e.g., 0.01 and 0.99, instead of 0 and 1. Do you have any thoughts on a sensible setting for the saturation values? My intuition suggests that it has something to do with proportion of outliers expected in the The post Robust...

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Crayfish or crawdad? Mapping US dialect variations with R

June 7, 2013
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Crayfish or crawdad? Mapping US dialect variations with R

I grew up in Australia, where I learned to speak English. Or so I thought: when I moved overseas to the UK, and especially when I moved to the States, I soon learned these are distinct cultures separated by a common language. Words which I previously had no context for being different anywhere else, such as "runners" ("sneakers"), "lemonade"...

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The Rcpp Book is now shipping

My book about Rcpp (and its R and C++ integration) is now available from Springer. Amazon still lists it as not-yet-released; I expect this to change in the next few days.

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Happy Birthday rasterVis!

Happy Birthday rasterVis!

Two years ago the first version of rasterVis was submitted to R-Forge and some weeks after the first stable version was …Continuar leyendo »

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A Shiny App Goes Viral

June 7, 2013
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A Shiny App Goes Viral

I am not sure how many of you have seen this Business Insider article.  It is basically about a shiny app created by Joshua Katz as NC State.  It is really fun playing with shiny app.With nearly a million facebook likes this web app buil...

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Income Distribution in London

June 7, 2013
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Income Distribution in London

Inspired by the Institute of Fiscal Studies' "Where do you fit in" application, where people can find out their position in the UK's income distribution, I wanted to find out how the picture in London looks like. Quite different. If you are in a very high percentile nationwide, high incomes of mainly financial sector employees in London...

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