3578 search results for "GIS"

Twitter Battle

December 2, 2013
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Twitter Battle

I love to have fun with R and Twitter...there are a lot of cool things that you can do with it...so I just thought of having a small Twitter Battle application...something that will grab the number of followers and lists from two users...apply some cra...

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Twitter unfollowers with R and Rook – Revisited

December 2, 2013
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Twitter unfollowers with R and Rook – Revisited

Some time ago I wrote a post called Twitter unfollowers with R and Rook where I used R and Twitter to get a list of the people that we follow...but that doesn't follow us back...Right now...that post is obsolete as Twitter changed its API to API 1...

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Basic overview of the rmongodb package for R

December 2, 2013
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I have been playing around with MongoDB quite a bit over the last few months.  Because I am much better at coding in R, I decided to write up my notes on how to use the rmongodb package. This is not a comprehensive tutorial by any stretch, but I wanted to share my notes as

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Speeding up model bootstrapping in GNU R

December 2, 2013
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After my last post I have recurringly received two questions: (a) is it worthwhile to analyze GNU R speed in simulations and (b) how would simulation speed compare between GNU R and Python. In this post I want to address the former question and next ti...

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Ensemble, Part2 (Bootstrap Aggregation)

December 1, 2013
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Ensemble, Part2 (Bootstrap Aggregation)

Part 1 consisted of building a classification tree with the "party" package.  I will now use "ipred" to examine the same data with a bagging (bootstrap aggregation) algorithm. > library(ipred)> train_bag = bagging(class ~ ., data=train, coob...

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A few random things

December 1, 2013
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Analyzing the DVI Indicator

November 30, 2013
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Analyzing the DVI Indicator

The DVI indicator is a well-known indicator, created by David Varadi from CSS Analytics. It was introduced in 2009 as a good predictor for the S&P 500 over the past 30 years. Its performance on the S&P 500 has been studied in the blogosphere comprehensively. None of these studies, however, contained everything I was looking

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Computing and visualizing PCA in R

November 28, 2013
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Computing and visualizing PCA in R

Following my introduction to PCA, I will demonstrate how to apply and visualize PCA in R. There are many packages and functions that can apply PCA in R. In this post I will use the function prcomp from the stats package. I will also show how to visualize PCA in R using Base R graphics.

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Mapping Power Outages in Maine Dynamically with Shiny/R

November 27, 2013
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I decided to forego the D3 map mentioned in the previous post in favor of a Shiny one since I had 90% of the mapping code written. I binned the ranges into three groups, changed the color over to something more pleasant (with RColorBrewer), added an interactive table for the counties with outage and have

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The little non-informative prior that could (be informative)

November 26, 2013
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The little non-informative prior that could (be informative)

Christian Robert reviewed on line a paper that was critical of non-informative priors. Among the points that were discussed by him and other contributors (e.g. Keith O’Rourke), was the issue of induced priors, i.e. priors which arise from a transformation of original parameters, or of observables. I found this exchange interesting because I did something

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