2961 search results for "gis"

Shapefiles in R

February 28, 2013
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Shapefiles in R

Let's learn how to use Shapefiles in R. This will allow us to map data for complicated areas or jurisdictions like zipcodes or school districts. For the United States, many shapefiles are available from the Census Bureau. Our example will map U.S. nati...

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EPL Table Motion Chart

February 28, 2013
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The Shiny package provides great user interactivity and another boost to its attractiveness has come with its integration with googleVis. Markus Gesman provides some background in a blog article with coded examples which he along with fellow googleVis creator, Diego de Castillo and lead Shiny developer Winson Chang have furnished There are at least three

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Summary of My First Trip to Strata #strataconf

February 28, 2013
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Summary of My First Trip to Strata #strataconf

In this post I am goIing to summarize some of the things that I learned at Strata Santa Clara 2013. For now, I will only discuss the conference sessions as I have a much longer post about the tutorial sessions that I am still working on and will post at a later date. I will add to this post...

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Pollination effectiveness landscape

February 28, 2013
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Pollination effectiveness landscape

I want to show you a pollination landscape, but this is not a pollinator landscape with flowers and nesting sites, but a plot showing two components of pollination. Quantity and quality. A recent paper by Pedro Jordano (see here for other … Continue reading →

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Pollination effectiveness landscape

February 28, 2013
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Pollination effectiveness landscape

I want to show you a pollination landscape, but this is not a pollinator landscape with flowers and nesting sites, but a plot showing two components of pollination. Quantity and quality. A recent paper by Pedro Jordano (see here for other … Continue reading →

Read more »

Classifying Emails as Spam or Ham using RTextTools

February 28, 2013
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Recently, I had read an article on R-bloggers, titled Classifying Breast Cancer as Benign or Malignent using RTextTools by Timothy P. Jurka, who is the author of both that article and the RTextTools package. Having reproduced the results using the...

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Workshops on Modelling Choices using R in Toronto

February 27, 2013
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Making choices is inherently human. We choose between brands of cereal or amongst candidates in an election. At times, choices may be influenced by the characteristics of the decision maker, such as age, income and sex. Choices may also be influenced by the attributes of competing alternatives, such as the cost of travelling between two cities by air or...

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UPDATE Multiple postgreSQL Table Records in Parellel

February 27, 2013
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UPDATE Multiple postgreSQL Table Records in Parellel

Unfortunately the RpostgreSQL package (I’m pretty sure other SQL DBs as well) doesn’t have a provision to UPDATE multiple records (say a whole data.frame) at once or allow placeholders making the UPDATE a one row at a time ordeal, so I built a work around hack to do the job in parellel.  The big problem

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How to make a scientific result disappear

February 27, 2013
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How to make a scientific result disappear

Nathan Danneman (a co-author and one of my graduate students from Emory) recently sent me a New Yorker article from 2010 about the “decline effect,” the tendency for initially promising scientific results to get smaller upon replication. Wikipedia can summarize the phenomenon as well as I can: In his article, Lehrer gives several examples where

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How to make a scientific result disappear

February 27, 2013
By
How to make a scientific result disappear

Nathan Danneman (a co-author and one of my graduate students from Emory) recently sent me a New Yorker article from 2010 about the “decline effect,” the tendency for initially promising scientific results to get smaller upon replication. Wikipedia can summarize the phenomenon as well as I can: In his article, Lehrer gives several examples where

Read more »