Odd smoother

September 27, 2012
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Odd smoother

I was flipping though the contents of G3 and saw this paper, which includes Jim Cheverud as an author. I poked through the paper, and my eye was attracted to the following figure. These are supposed to be functions, but some weird smoother was used,...

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Continuous dispersal on a discrete lattice

September 27, 2012
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Continuous dispersal on a discrete lattice

*Edit: I made a video! Dispersal is a key process in many domains, and particularly in ecology. Individuals move in space, and this movement can be modelled as a random process following some kernel. The dispersal kernel is simply a probability distribution describing the distance travelled in a given time frame. Since space is continuous,

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Calling Minimum Correlation Algorithm from Excel using RExcel & VBA

September 27, 2012
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Calling Minimum Correlation Algorithm from Excel using RExcel & VBA

I want to show the example of calling the Minimum Correlation Algorithm from Excel. I will use RExcel to connect R and Excel and will create a small VBA cell array function to communicate between Excel and R. I have previously discussed the concept of connecting R and Excel in the “Calling Systematic Investor Toolbox [...]

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Significance of early voting

September 27, 2012
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Andrew Sullivan highlights the significance of early voting in U.S. Presidential Elections (link). His second quote (from The Fix) requires a visit to your statistical adviser. Andrew considers this an "important point": Democrats generally vote early more than Republicans. In the five 2012 swing states where a 2008 early voting breakdown is available, Democrats voted early more than Republicans in all five. Even in a very good GOP year in…

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eeptools 0.1 Available on CRAN Now!

September 26, 2012
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eeptools 0.1 is available now on CRAN! You can install it by simply typing:install.packages('eeptools')in your R console now. The package allows users to play with a number of built in datasets for folks in education beginning to learn R, custom themes...

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structure and uncertainty, Bristol, Sept. 26

September 26, 2012
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structure and uncertainty, Bristol, Sept. 26

Another day full of interesting and challenging—in the sense they generated new questions for me—talks at the SuSTain workshop. After another (dry and fast) run around the Downs; Leo Held started the talks with one of my favourite topics, namely the theory of g-priors in generalized linear models. He did bring a new perspective on [...]

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Levels of Inquiry

September 26, 2012
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Levels of Inquiry

Many fallacious uses of statistical methods result from supposing that the statistical inference licenses a jump to a substantive claim that is ‘on a different level’ from a statistical one being probed. Given the familiar refrain that statistical significance is not substantive significance, it may seem surprising how often criticisms of significance tests depend on [...]

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Pro-tips for graduate students (Part 3)

September 26, 2012
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This is part of the ongoing series of pro tips for graduate students, check out parts one and two for the original installments.  Learn how to write papers in a very clear and simple style. Whenever you can write in plain English, skip jargon as much ...

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What do statistical p-values mean when the sample = the population?

September 26, 2012
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Felipe Nunes writes: I have many friends working with data that they claim to be considered as a ‘population’. For example, the universe of bills presented in a Congress, the roll call votes of all deputies in a legislature, a survey with all deputies in a country, the outcomes of an election, or the set [...]

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Light entertainment: impossible is nothing!

September 26, 2012
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Light entertainment: impossible is nothing!

Reader Julien D. sent in this image, which apparently has been in circulation. This company has a whole series of these ads running.

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InformationWeek: Tibco Spotfire Revamp Supports Big Data Analytics

September 26, 2012
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InformationWeek: Tibco Spotfire Revamp Supports Big Data Analytics

Tibco Spotfire, already popular for finding the proverbial needle in the haystack, now works smarter with the biggest haystacks.By Doug Henschen  InformationWeekSeptember 25, 2012 02:14 PMBig Data Talent War: 10 Analytics Job Trends(click ima...

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Some regressions on school data

September 26, 2012
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Some regressions on school data

Eric and I have been exchanging emails about potential analyses for the school data and he published a first draft model in Offsetting Behaviour. I have kept on doing mostly data exploration while we get a definitive full dataset, and … Continue reading →

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Links and Widgets: the Fabric of the Web

September 26, 2012
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By Xavier Badosa on Sep 25, 2012Opening contribution to the Task force for the strategic project on the development and use of common ESS tools and services for dissemination. Eurostat, Luxembourg, 20 September 2012 Links and Widgets: the Fabric of t...

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A surprising result: The expected number of uniform variates whose sum exceeds one

September 26, 2012
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A surprising result: The expected number of uniform variates whose sum exceeds one

I was recently flipping through Ross' Simulation (2006, 4th Edition) and saw the following exercise: Let N be the minimum number of draws from a uniform distribution that exceed 1. What is the expected value of N? Write a simulation to estimate the expected value. For example, if v = [...]

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NBC Unpacks Trove of Data From Olympics

September 26, 2012
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NBC Unpacks Trove of Data From Olympics: Studies of more than 50,000 people who watched the Games depict vast shifts in how people watch television, especially with second devices like tablets or smartphones.

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Minimum Correlation Algorithm Speed comparison

September 26, 2012
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Minimum Correlation Algorithm Speed comparison

The Minimum Correlation Algorithm is a heuristic method discovered by David Varadi. Below I will benchmark the execution speed of 2 versions of the Minimum Correlation Algorithm versus the traditional minimum variance optimization that relies on solving a quadratic programming problem. I have run the code above for n=10 (10 assets), n=100 (100 assets), n=500 [...]

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Guest post: Visualizing data using a 3D printer

September 25, 2012
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Guest post: Visualizing data using a 3D printer

In a break from my usual obsessions and interests here is a guest blog post by Ian Walker. I'm posting it because I think it is rather cool and hope it will be of interest to some of my regular readers. Ian is perhaps best known (in the blogosphere) f...

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Twitter Economics

September 25, 2012
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Twitter Economics

I think I've spent far too much time trying to find a suitable picture to go with this post (but I have to say I'm very happy with the final output!). Anyway: this is potentially quite interesting. The Academic Health Economists' Blog are lau...

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Specifying Variables in R

September 25, 2012
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Specifying Variables in R

R has several ways to specify which variables to use in an analysis. Some of the most frustrating errors can result from not understanding the order in which R searches for variables. This post demonstrates that order, hopefully smoothing your … Continue reading →

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The Water We Eat: Scroll-Down Infographic Story on Water Usage

September 25, 2012
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The Water We Eat: Scroll-Down Infographic Story on Water Usage

The Water We Eat [angelamorelli.com] by information designer Angela Morelli is an infographic story that unfolds by the act of scrolling down the page. It features various animated visual elements that move, appear, rotate, zoom or fall, to convey t...

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Incoherence of Bayesian data analysis

September 25, 2012
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Hogg writes: At the end this article you wonder about consistency. Have you ever considered the possibility that utility might resolve some of the problems? I have no idea if it would—I am not advocating that position—I just get some kind of intuition from phrases like “Judgment is required to decide…”. Perhaps there is a [...]

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