Monthly Archives: April 2012

Web-Scraping in R

April 2, 2012
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Web-Scraping in R

Web-scraping, or web-crawling, sounds like a seedy activity worthy of an Interpol investigative department. The reality, however, is far less nefarious. Web-scraping is any procedure by which someone extracts data from the internet. Given that it’s possible to get the internet on computers these days; web-scrapping opens an array of interesting possibilities to social-science researchers

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An unabashedly narcissistic data analysis of my own tweets. The…

April 2, 2012
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An unabashedly narcissistic data analysis of my own tweets.
The…

pie( table( whence.i.tweet )) qplot( whence ) + coord_polar() pie( log( table( whence )))+RColorBrewer ggplot (see below) plot( density( tweets.len )) qplot(... stat="density") + geom_density qplot(...stat="bin") + geom_text(...) tweeple tweep...

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Working with Globcolour data

April 2, 2012
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Working with Globcolour data

The Globcolour project (http://www.globcolour.info/) provides relatively easy access to ocean color remote sensing data. Data is provided at http://hermes.acri.fr/and the following parameters are available:· Chlorophyll-a (CHL1 and CHL2)· Fully normalised water leaving radiances at 412, 443, 490, 510, 531, 550-565, 620, 665-670, 681 and 709 nm (Lxxx)· Coloured dissolved and detrital...

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Introduction to ORE Embedded R Script Execution

April 2, 2012
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Introduction to ORE Embedded R Script Execution

This Oracle R Enterprise (ORE) tutorial, on embedded R execution, is the third in a series to help users get started using ORE. See these links for the first tutorial on the transparency layer and second tutorial on the statistics engine. Oracle R Enterprise is a component in the Oracle Advanced Analytics Option of Oracle Database Enterprise...

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Add a frame to a map

April 2, 2012
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Add a frame to a map

Here is a function that adds a frame of alternating colors to a map (un-projected). One defines the extension of each bar (in degrees) and an optional width of the bars (in inches). It uses the "joinPolys" function of the package to trim the bars near the map corners where the axes meet.the map.frame...

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3-D graphing with Google

April 2, 2012
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3-D graphing with Google

You probably already knew that you can draw mathematical equations in Google by typing the equation into the search box. For example, here's the Standard Normal density function: I can't find a way to embed the graph directly, but if you click on it you'll find it's interactive: you can inspect points, zoom in/out etc. You can create a...

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Playing with fire (or water)

April 2, 2012
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Playing with fire (or water)

A few days ago, http://www.futilitycloset.com/ published a short post based on the fourth problem of the 1987 Canadian Mathematical Olympiad (from on a problem from the 6th All Soviet Union Mathematical Competition in Voronezh, 1966). The problem i...

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Example 9.25: It’s been a mighty warm winter? (Plot on a circular axis)

April 2, 2012
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Example 9.25: It’s been a mighty warm winter? (Plot on a circular axis)

Updated (see below)People here in the northeast US consider this to have been an unusually warm winter. Was it?The University of Dayton and the US Environmental Protection Agency maintain an archive of daily average temperatures that's reasonably current. In the case of Albany, NY (the most similar of their records to our...

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Surveys, Assumptions, and the Need for Data Collection Alternatives

April 2, 2012
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Surveys, Assumptions, and the Need for Data Collection Alternatives

This is a long post. My previous posts have mostly been about my thoughts on various research subjects. This one reports an actual analysis. If you don’t want to read the whole thing, here are the highlights: We really need to stop using surveys so much. If we have to use surveys, it’s probably best

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My main resources for R programming

April 2, 2012
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My main resources for R programming

In this article, you will find a list of Internet resources that may be useful if you are programming in R. If you have a problem with R and

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