Monthly Archives: July 2013

There is definitely R in July

July 1, 2013
By
There is definitely R in July

The useR!2013 conference in Albacete, Spain, will commence next Wednesday, 10 July, and on the day before Diego and I will give a googleVis tutorial. The following Monday, 15 July, the first R in Insurance event will take place at Cass Business School ...

Read more »

Some Common Approaches for Analyzing Likert Scales and Other Categorical Data

July 1, 2013
By
Some Common Approaches for Analyzing Likert Scales and Other Categorical Data

Analyzing Likert scale responses really comes down to what you want to accomplish (e.g. Are you trying to provide a formal report with probabilities or are you trying to simply understand the data better). Sometimes a couple of graphs are sufficient and a formalize statistical test isn’t even necessary. However, with how easy it is

Read more »

integral priors for binomial regression

July 1, 2013
By
integral priors for binomial regression

Diego Salmerón and Juan Antonio Cano from Murcia, Spain (check the movie linked to the above photograph!), kindly included me in their recent integral prior paper, even though I mainly provided (constructive) criticism. The paper has just been arXived. A few years ago (2008 to be precise), we wrote together an integral prior paper, published

Read more »

Using ESS-Remote

July 1, 2013
By

If you use R and ssh into other machines a lot, e.g. for doing some big data stuff on ec2, ess-remote is a great tool. Just use M-x ssh to ssh into the remote machine, then launch R. Now just M-x ess-remote and you can use the R process just like a local process! Productivity win. Also see

Read more »

Maximum Entropy Bootstrap Rescale and Symmetrize

July 1, 2013
By

R code for changing scale without changing mean or to make a probability distribution symmetric. These are commonly encountered problems by R programmers. We provide code for both of these tasks in the context of maximum entropy bootstrap (meboot) package in R.

Read more »

OpenAnalytics @ UseR 2013: What’s on the Program?

July 1, 2013
By

Monday 1 July 2013 - 22:37 OpenAnalytics is once more proud sponsor of the yearly R User Conference and sent a strong delegation to present some of its recent work. On Tuesday July 9 Tobias Verbeke and Stephan Wahlbrink give a pre-conference...

Read more »

Power and sample size calculator for mitochondrial DNA association studies (Shiny)

July 1, 2013
By
Power and sample size calculator for mitochondrial DNA association studies (Shiny)

The functions detailed inside the piece of code below (in a Gist) has been useful for me when I had to calculate many possible scenarios of statistical power and sample size. The formulae were taken from the article of Samuels … Sigue leyendo →

Read more »

Web Analytics Visualization through ggplot2

July 1, 2013
By
Web Analytics Visualization through ggplot2

During our last webinar, we covered some of the basic ideas behind ggplot2, the R Visualization package by Dr. Hadley Wickham. In this blog post I will walk through the example that I covered during the webinar. In order to carry out the examples yourself, you may download the dummy datasets from this link Creating

Read more »

R and PostgreSQL – using RPostgreSQL and sqldf

July 1, 2013
By

PostgreSQL and R can often be used together for data analysis - PostgreSQL as database engine and R as statistical tool. In this article you will learn how to access data stored in PostgreSQL database and how to write the data back using RPostgreSQL an...

Read more »

Monitoring an ETF Portfolio in R

July 1, 2013
By
Monitoring an ETF Portfolio in R

Adam Duncan Also avilable on R-bloggers.com Some time ago, I read an interesting article about an interview with David Swensen, the renownd money manager from Yale University’s investment office. He’s quite famous and is considered by many to be the architect of the modern “endowment portfolio.” The point of the article was to suggest a way for ordinary...

Read more »