2056 search results for "ggplot"

Unemployment

January 20, 2013
By
Unemployment

I want to exercise a bit more with ggplot2 and there is always data to be gotten from Eurostat which is interesting. In Netherlands the statistics agency (CBS) brought these headlines (translated with http://translate.google.nl/):Unemployment...

Read more »

Choosing colors visually with ‘getcolors’

January 18, 2013
By
Choosing colors visually with ‘getcolors’

When plotting, I am constantly defaulting to the "main" colors in R - In other words, the colors that one can quickly call by number (1="black", 2="red", 3="green", 4="blue", ... etc.) . In my opinion, these colors do not lend themselves well to compelling graphics. I imagine this is the reason for the inclusion...

Read more »

Power Calculations – relationship between test power, effect size and sample size

January 17, 2013
By
Power Calculations – relationship between test power, effect size and sample size

I was interested in modeling the relationship between the power and sample size, while holding the significance level constant (p = 0.05) , for the common two-sample t-Test. Luckily R has great support for power analysis and I found the function I was looking for in the package pwr. To calculate the power for the two-sample T-test

Read more »

SHODAN API in R (With Examples)

January 17, 2013
By
SHODAN API in R (With Examples)

Folks may debate the merits of the SHODAN tool, but in my opinion it’s a valuable resource, especially if used for “good”. What is SHODAN? I think ThreatPost summed it up nicely: “Shodan is a Web based search engine that discovers Internet facing computers, including desktops, servers and routers. The engine, created by programmer John

Read more »

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

January 17, 2013
By
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 ...

Read more »

Review of R Graphics Cookbook by Winston Chang

January 16, 2013
By

I just got a copy of Winston Chang's book R Graphics Cookbook, published by O'Reilly Media. This book follows now a series of O'Reilly books on R, including an R Cookbook. Winston Chang is a graduate student at Northwestern University but … Continue reading →

Read more »

Restricted Boltzmann Machines in R

January 14, 2013
By
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...

Read more »

European Migration

January 13, 2013
By
European Migration

Last week on the radio I heard a story of southern Europeans and Irish looking for better times in northern Europe. I heard the tale of an Italian academic who left Italy to end up waiting tables in an Italian restaurant in the Netherlands. Obviously t...

Read more »

How Low Can It [The Mississsippi River] Go?

January 12, 2013
By
How Low Can It [The Mississsippi River] Go?

I’ve heard quite a bit about the current problems with the Mississippi River and wanted to see for myself (with data) just how bad it is. St Louis seems to be quite indicative of the severity of the situation, so I pulled the USGS “stream” records for it and also the historic low water level

Read more »

Heat maps using R

January 12, 2013
By
Heat maps using R

One of the great things about following blogs on R is seeing what others are doing & being able to replicate and try out things on my own data sets. For example, some great links on rapidly creating heat maps using R. Drawing Heat Maps in R How to Make a Heatmap – a Quick

Read more »