4042 search results for "git"

The Heteroskedastic Probit Model

November 19, 2012
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The Heteroskedastic Probit Model

Specification testing is an important part of econometric practice. However, from what I can see, few researchers perform heteroskedasticity tests after estimating probit/logit models. This is not a trivial point. Heteroskedasticity in these models can represent a major violation of the probit/logit specification, both of which assume homoskedastic errors. Thankfully, tests for heteroskedasticity in these

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R and SQLite: Part 1

November 18, 2012
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Creating SQLite databases from R

Interactive Scenarios With Shiny – The Race to the F1 2012 Drivers’ Championship

November 18, 2012
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Interactive Scenarios With Shiny – The Race to the F1 2012 Drivers’ Championship

In Paths to the F1 2012 Championship Based on How They Might Finish in the US Grand Prix I posted a quick hack to calculate the finishing positions that would determine the F1 2012 Drivers’ Championship in today’s United States Grand Prix, leaving a tease dangling around the possibility of working out what combinations would

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Sunday Data/Statistics Link Roundup (11/18/12)

November 18, 2012
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An interview with Brad Efron about scientific writing. I haven’t watched the whole interview, but I do know that Efron is one of my favorite writers among statisticians. Slidify, another approach for making HTML5 slides directly from R.  I love … Continue reading →

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Datacentric product development and the rebirth of engineering

November 17, 2012
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Datacentric product development and the rebirth of engineering

An old irony in New York is the ubiquity of the ‘gourmet deli’. It is hard to find a deli …Continue reading »

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More sense of random effects

November 17, 2012
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More sense of random effects

I can’t exactly remember how I arrived to Making sense of random effects, a good post in the Distributed Ecology blog (go over there and read it). Incidentally, my working theory is that I follow Scott Chamberlain (@recology_), who follows … Continue reading →

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Get the exit polls from CNN using R and Python

November 17, 2012
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Yesterday I posted an example of plotting 2012 U.S. presidential exit poll results using ggplot2. There I took for granted that a data.frame containing all we need resides in a file called "PresExitPolls2012.Rdata". Today I want to show how I scraped t...

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Visualizing Missing Data

November 17, 2012
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Visualizing Missing Data

There are several graphics available for visualizing missing data including the VIM package. However, I wanted a plot specifically for looking at the nature of missingness across variables and a clustering variable of interest to support data preparati...

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Visualizing Missing Data

November 17, 2012
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Visualizing Missing Data

There are several graphics available for visualizing missing data including the VIM package. However, I wanted a plot specifically for looking at the nature of missingness across variables and a clustering variable of interest to support data preparati...

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The Race to the F1 2012 Drivers’ Championship – Initial Sketches

November 16, 2012
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The Race to the F1 2012 Drivers’ Championship – Initial Sketches

In part inspired by the chart described in The electoral map sans the map, I thought I’d start mulling over a quick sketch showing the race to the 2012 Formula One Drivers’ Championship. The chart needs to show tension somehow, so in this first really quick and simple rough sketch, you really do have to

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