2775 search results for "gis"

Calculating a Gini Coefficients for a Number of Locales at Once in R

January 17, 2013
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Calculating a Gini Coefficients for a Number of Locales at Once in R

The Gini coefficient is a measure of the inequality of a distribution, most commonly used to compare inequality in income or wealth among countries.Let's first generate some random data to analyze. You can download my random data or use the code below ...

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Maize trade Part I: Generate the network diagram

January 17, 2013
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Maize trade Part I: Generate the network diagram

It has been several month since my last post, partially due to the fact that my laptop was lost and several deadlines was approaching. Fortunately I will be returning to Taiwan and get a new laptop within a week, and will be updating regularly...

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Steve Culman on the `plyr` Package

January 17, 2013
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At Davis R Users’ Group yesteray, Steve Culman gave us an introduction to the plyr package and how to use it to manipulate data. Here’s his presentation, and the accompanying demonstration script: Steve’s talk is based on this paper by Hadley Wickham in the Journal of Statistical Software. A lot of useful related...

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Plotting Odds Ratios (aka a forrestplot) with ggplot2 –

January 17, 2013
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Plotting Odds Ratios (aka a forrestplot) with ggplot2 –

Hi, if you like me work in medical research, you have to plot the results of multiple logistic regressions every once in a while. As I have not yet found a great solution to make these plots I have put together the following short skript. Do not expect too much, it’s more of a reminder

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Two free online courses starting soon: Data Analysis (with R) and Social Network Analysis

January 17, 2013
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Two free online courses starting soon: Data Analysis (with R) and Social Network Analysis

There are two online courses starting soon on Coursera, which are free to register. 1. Data Analysis (with R) It is a 8-week online course starting on Jan 22nd 2013 <https://www.coursera.org/course/dataanalysis>. This course is an applied statistics course focusing on … Continue reading →

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Slightly Different Measure of Valuation

January 16, 2013
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Slightly Different Measure of Valuation

I grow tired of the tried and true standard measures of valuation, and from time to time I try to think of alternate methods.  One thought was to analyze Ken French’s Market(ME) to Book(BE) Breakpoints by percentile.  We can see by year at ...

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Wikipedia page views

January 16, 2013
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Wikipedia page views

Here I present an application that quantifies Wikipedia page views. It can visualise any topic in any language. It is (shamelessly) based on an application by the blogger Andrew Clark (pssguy), whose code is available here.I have added:multi ...

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{stargazer} package for beautiful LaTeX tables from R statistical models output

January 14, 2013
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{stargazer} package for beautiful LaTeX tables from R statistical models output

stargazer is a new R package that creates LaTeX code for well-formatted regression tables, with multiple models side-by-side, as well as for summary statistics tables. Its latest version, released in early January 2013, can also output the content of data …Read more »

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analyze the health and retirement study (hrs) with r

January 14, 2013
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the hrs is the one and only longitudinal survey of american seniors.  with a panel starting its third decade, the current pool of respondents includes older folks who have been interviewed every two years as far back as 1992.  unlike cross-se...

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Restricted Boltzmann Machines in R

January 14, 2013
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Restricted Boltzmann Machines in R

Restricted Boltzmann Machines (RBMs) are an unsupervised learning method (like principal components). An RBM is a probabilistic and undirected graphical model. They are becoming more popular in machine learning due to recent success in training them with contrastive divergence. They have been proven useful in collaborative filtering, being one of the most successful methods...

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