2046 search results for "Twitter"

Parametric Bootstrap Power Analysis of GISS Temp Data

October 24, 2010
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Parametric Bootstrap Power Analysis of GISS Temp Data

Previosly, I calculated a bunch of ad-hoc power curves from GISTEMP data. Power is essentially a reframing of the p-value, to see the significance of the trend lines in the global temps. However, power calculations are inherently very noisy, hence, my ad-hoc way of aggregating the data. Another method is to bootstrap through the responses

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Accessing R from Python using RPy2

October 24, 2010
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This past Tuesday I had the opportunity to present a short talk (a bit long) related to text mining at the Los Angeles R Users’ Group. Since I do most of my text mining in Python, I took this opportunity to discuss RPy2, an interface to R from Python. My slides are below: Accessing R from Python...

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Le Monde puzzle [42]

October 24, 2010
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Le Monde puzzle [42]

An interesting suduko-like puzzle for this week puzzle in Le Monde thi A 10×10 grid is filled by a random permutation of {0,…,99}. The 4 largest figures in each row are coloured in yellow and the 4 largest values in each column are coloured in red. What is the range of the number of yellow-and-red

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Incremental improvements to Nightlights mapping thanks to R-Bloggers

October 22, 2010
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Incremental improvements to Nightlights mapping thanks to R-Bloggers

The R community is very generous and collaborative. This post walks through the suggestions left by commenters to my previous post on Steve Mosher's Nightlights work, and show the resulting much-improved output.

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abc

October 21, 2010
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abc

Michael Blum and Olivier François, along with Katalin Csillery, just released an R package entitled abc. (I am surprised the name was not already registered!) Its aim is obviously to implement ABC approximations for Bayesian inference: Description The ’abc’ package provides various functions for parameter estimation and model selection in an ABC framework. Three main

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vecLib: Why Mac users are better off with Open Source R

October 21, 2010
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vecLib: Why Mac users are better off with Open Source R

Thanks to its use of Apple's vecLib for BLAS, LAPACK and related functions, the open source distribution of R performs many matrix calculations 2-10X faster than Revolution Analytics Community edition on Mac OS X systems.

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What’s that 5km from the station “location”

October 21, 2010
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What’s that 5km from the station “location”

In our last installment we looked at stations which were pitch black. The case I examined, Middlesboro Kentucky illustrated 1. The station location data used by Hansen2010 has inaccuracies. 2. While the purported station location was pitch dark, nearby within a couple 1/100ths of a degree there were urban lights. What this example illustrated was

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Installing rJava on Ubuntu

October 20, 2010
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Installing rJava on Ubuntu

I had some troubles installing rJava on Ubuntu. The easiest solution I found was installing from the command line using: Then it worked without any problems.

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Hold on to your hats: it’s World Statistics Day!

October 20, 2010
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Apparently today is the first ever World Statistics Day. I only knew about it because I'd seen a couple of passing references to it from the stats folks I follow on Twitter. But I guess this UN-sponsored event is a big deal, judging from the official website: The celebration of the World Statistics Day will acknowledge the service provided...

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Trading secrets

October 20, 2010
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Trading secrets

Recently I had the opportunity to do a job swap with one of the guys in the laboratory here at HSL.  I helped out with the mass-spectrometry and James helped me with the data analysis.  Two very useful things came out of this. Firstly, it’s been very informative to see how the data I get

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