Monthly Archives: September 2010

Managing a statistical analysis project – guidelines and best practices

September 30, 2010
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Had to share this link today as I better read all the content it refers to and incorporate a lot of the recommended practices into my work flow. Thanks Tal Galili for compiling all those information.

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Mandelbrot Set, evolved

September 30, 2010
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Mandelbrot Set, evolved

The Mandelbrot Set is perhaps the most famous fractal of all time. It's simple in its definition: iterate the complex equation zn+1 = zn2 + c (starting with z0 = 0) for various values of c, and if doesn't go to infinity then c is part of the Mandelbrot Set. The result, however, is amazingly complex. Thinking of c...

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Plotting Time Series data using ggplot2

September 30, 2010
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Plotting Time Series data using ggplot2

There are various ways to plot data that is represented by a time series in R. The ggplot2 package has scales that can handle dates reasonably easily. Fast Tube by Casper As an example consider a data set on the number of views of the you tube channel ramstatvid. A short snippet of the data is shown

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Managing a statistical analysis project – guidelines and best practices

September 30, 2010
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In the past two years, a growing community of R users (and statisticians in general) have been participating in two major Question-and-Answer websites: The R tag page on Stackoverflow, and Stat over flow (which will soon move to a new domain, no worries, I’ll write about it once it happens) In that time, several long (and fascinating) discussion threads where started,...

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New version of solaR

September 30, 2010
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New version of solaR

The version 0.2 of the solaR package is now available at CRAN. This package provides a set of calculation methods of solar radiation and performance of photovoltaic systems. The package has been uploaded to CRAN under the GPL-3 license. The most important changes included in this version are: The package is now almost entirely designed

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Moshtemp 5.1

September 29, 2010
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Moshtemp 5.1

Time for another dump of the entire package. Get the zip file 5.1 in the box to the right. ( shortly). unzip and run the following files if you havent already: 1. downloadall.R 2. setup.R If you are running for the first time, You’ll note I added diagnostics. Sometimes the files get corrupted on download

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Le Monde puzzle [38]

September 29, 2010
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Le Monde puzzle [38]

Since I have resumed my R class, I will restart my resolution of Le Monde mathematical puzzles…as they make good exercises for the class. The puzzle this week is not that exciting: Find the four non-zero different digits a,b,c,d such that abcd is equal to the sum of all two digit numbers made by picking

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NewTwitter design based on a Golden Spiral

September 29, 2010
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NewTwitter design based on a Golden Spiral

I finally got the new version of Twitter yesterday, and it looks great. And that's no accident: according to the designer, the layout of the new Twitter interface is based on the Golden Spiral: You can describe the Golden Spiral by laying consecutive squares in a spiral fashion, each square being smaller than the last by a factor of...

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UCLA Statistics: Analyzing Thesis/Dissertation Lengths

September 29, 2010
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UCLA Statistics: Analyzing Thesis/Dissertation Lengths

As I am working on my dissertation and piecing together a mess of notes, code and output, I am wondering to myself “how long is this thing supposed to be?” I am definitely not into this to win the prize for longest dissertation. I just want to say my piece, make my point and move on. I’ve heard that...

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A Visualization of Soil Taxonomy Down to the Subgroup Level

September 29, 2010
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A Visualization of Soil Taxonomy Down to the Subgroup Level

It turns out that you can generate a quasi-numerical distance between soil profiles classified according to Soil Taxonomy (or any other hierarchical system) using Gower's generalized dissimilarity metric. For example, taxonomic distances computed from ...

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