Monthly Archives: August 2011

Big Analytics: Closing the "clue gap" with Big Data

August 31, 2011
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There's been an growing discussion over the past couple of years on the topic of Big Data: how to deal with the situation when you have more data than can be conveniently managed and analyzed by traditional software tools. But Big Data has little intrinsic value in its own right: its value is only realized when you can deploy...

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Adding a scale to an image plot

August 31, 2011
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Adding a scale to an image plot

Here's a function that allows you to add a color scale legend to an image plot (or probably any plot needing a z-level scale). I found myself having to program this over and over again, and just decided to make a plotting function for future use. While I really like the look of levelplot(),...

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Part 1 of 3: Building/Loading/Scoring Against Predictive Models in R

August 31, 2011
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In this first installment, I'm going to focus on:Building/evaluating a predictive model with partitioned dataSaving the predictive model to diskLoading the predictive model from diskScoring data against a predictive model (within R)This installment is ...

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Seriously … why don’t math classes use computers?…

August 31, 2011
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Seriously … why don’t math classes use computers? Excel, simple Python scripts, Mathematica / Sage, everything beyond the TI-83. Kids could be creating totally sweet visuals instead of cribbing formulae. And thinking instead of copying. I can sa...

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Seriously … why don’t math classes use computers?…

August 31, 2011
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Seriously … why don’t math classes use computers? Excel, simple Python scripts, Mathematica / Sage, everything beyond the TI-83. Kids could be creating totally sweet visuals instead of cribbing formulae. And thinking instead of copying. I can sa...

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Story of the Ljung-Box Blues: Progress Not Perfection

August 31, 2011
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Story of the Ljung-Box Blues: Progress Not Perfection

In the last post we determined that our ARIMA(2,2,2) model failed to pass the Ljung-Box test.  In todays post we seek to completely discredit the last posts claim and finally arrive at some needed closure. The Ljung-Box is first performed on the s...

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rnpn: An R interface for the National Phenology Network

August 31, 2011
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rnpn: An R interface for the National Phenology Network

The team at rOpenSci and I have been working on a wrapper for the USA National Phenology Network API. The following is a demo of some of the current possibilities. We will have more functions down the road. Get the publicly available code, and contribu...

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XLConnect – A platform-independent interface to Excel

August 31, 2011
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XLConnect – A platform-independent interface to Excel

XLConnect is a comprehensive and platform-independent R package for manipulating Microsoft Excel files from within R. XLConnect differs from other related R packages in that it is completely cross-platform and as such runs under Windows, Unix/Linux and Mac (32- and 64-bit). Moreover, it … Continue reading →

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Posts of the year

August 30, 2011
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Posts of the year

Like last year, here are the most popular posts since last August: Home page 92,982 In{s}a(ne)!! 6,803 “simply start over and build something better” 5,834 Julien on R shortcomings 2,373 Parallel processing of independent Metropolis-Hastings algorithms 1,455 Do we need an integrated Bayesian/likelihood inference? 1,361 Coincidence in lotteries 1,256 #2 blog for the statistics geek?! 863

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What language is R written in?

August 30, 2011
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What language is R written in?

On of the nice things about R is that a lot if it is written in the R language. That means, as an R user, if you want to see how R calculates a certain statistic, or you want to modify an existing function for your own use, you can just look at the R code by typing the...

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