August 2011

Groovy. Batch. Prepared statement. Nice!

August 31, 2011 | 0 Comments

Scripting with Groovy is exciting thing. You get a feeling that the language was inspired by an Oracle who read your mind and then made it 10 times better. So imagine how I felt after finding out that Groovy can NOT batch prepared statements.Batching sql updates, inserts or deletes is ... [Read more...]

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

August 31, 2011 | 0 Comments

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: ... [Read more...]

Adding a scale to an image plot

August 31, 2011 | 0 Comments

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 ... [Read more...]

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

August 31, 2011 | 0 Comments

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... [Read more...]

Story of the Ljung-Box Blues: Progress Not Perfection

August 31, 2011 | 0 Comments

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 | 0 Comments

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 | 0 Comments

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 → [Read more...]

Posts of the year

August 30, 2011 | 0 Comments

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 ... [Read more...]

What language is R written in?

August 30, 2011 | 0 Comments

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 ... [Read more...]

The Visual Difference – R and Anscombe’s Quartet

August 30, 2011 | 0 Comments

I spent a chunk of today trying to get my thoughts in order for a keynote presentation at next week’s The Difference that Makes a Difference conference. The theme of my talk will be on how visualisations can be used to discover structure and pattern in data, and as ... [Read more...]

Nomograms everywhere!

August 30, 2011 | 0 Comments

At useR!, Jonty Rougier talked about nomograms, a once popular visualisation that has fallen by the wayside with the rise of computers. I’d seen a few before, but hadn’t understood how they worked or why you’d want to use them. Anyway, since that talk I’ve been ... [Read more...]

R combined gps-track plot of spatial intensity

August 30, 2011 | 0 Comments

To get a quick impression about the temporal stay of places it is helpful to generate a plot of the trackpoints spatial density (intensity). As the 3d visualisation has both advatages and disadvantages, a combination with a 2D plot is useful to interpret the data. The data used in this ... [Read more...]

Realized beta and beta equal 1

August 30, 2011 | 0 Comments

What does beta look like in the out-of-sample period for the portfolios generated to have beta equal to 1? In the comments Ian Priest wonders if the results in “The effect of beta equal 1″ are due to a shift in beta from the estimation period to the out-of-sample period.  (The current ... [Read more...]

Sharing live R functions with OpenCPU

August 29, 2011 | 0 Comments

OpenCPU is a new initiative from R user Jeroen Ooms to make innovations in statistics, visualization and data-science more widely applicable. Based on open-source principles, it's a web-based service that lets you upload data visualizations and analyses as R scripts, and allow others to run them on demand. For example, ... [Read more...]

another lottery coincidence

August 29, 2011 | 0 Comments

Once again, meaningless figures are published about a man who won the French lottery (Le Loto) for the second time. The reported probability of the event is indeed one chance out of 363 (US) trillions (i.e., billions in the metric system. or 1012)… This number is simply the square of which ... [Read more...]

The effect of beta equal 1

August 29, 2011 | 0 Comments

Investment Performance Guy had a post about beta equal 1.  It made me wonder about the properties of portfolios with beta equal 1.  When I looked, I got a bigger answer than I expected. Data I have some S&P 500 data lying about from the post ‘On “Stock correlation has been rising”‘.  ... [Read more...]

Comparing Two Distributions

August 29, 2011 | 0 Comments

Here I compare two distributions, flowering duration of indigenous and allochtonous plant species. The hypothesis is that alien compared to indigenous plant species exhibit longer flowering periods. Read more » [Read more...]
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