Monthly Archives: August 2012

Cluster Multiple Images with ImageJ and R

August 31, 2012
By

30.08.2012 With Bio7 1.6 it is possible to send multiple images from ImageJ to R without the need to open them in the Graphical User Interface of ImageJ for speed improvements. With a simple script written in Java, Groovy or BeanShell a new Bio7 API command can be used (see below) to transfer images and

Read more »

Getting ecology and evolution journal titles from R

August 31, 2012
By

So I want to mine some #altmetrics data for some research I'm thinking about doing. The steps would be: Get journal titles for ecology and evolution journals. Get DOI's for all papers in all the above journal titles. Get altmetrics data on each DO...

Read more »

Follow-Up: Making a Word Cloud for a Search Result from GScholar_Scraper_3.1

August 30, 2012
By
Follow-Up: Making a Word Cloud for a Search Result from GScholar_Scraper_3.1

Here's a short follow-up on how to produce a word cloud for a search result from GScholarScraper_3.1:# File-Name: GScholarScraper_3.1.R# Date: 2012-08-22# Author: Kay Cichini# Email: [email protected]# Purpose: Scrape Google Scholar search result# ...

Read more »

My Course Wish List at CMSE next year

August 30, 2012
By
My Course Wish List at CMSE next year

Here is the list  of courses I wish to teach next year at Chiang Mai School of Economics, not so sure about the demand there! Undergraduate (B.Econ.) ECON 304: Economics Statistics (with R) ECON 408: Research Design in Economics ECON 417: Managerial Economics ECON 419: Economic Theory and Entrepreneurship ECON 443: Industrial Economics ECON 4xx: Introduction to

Read more »

Stan is fast

August 30, 2012
By

10,000 iterations for 4 chains on the (precompiled) efficiently-parameterized 8-schools model: > date () "Thu Aug 30 22:12:53 2012" > fit3 date () "Thu Aug 30 22:12:55 2012" > print (fit3) Inference for Stan model: anon_model. 4 chains: each with iter=10000; warmup=5000; thin=1; 10000 iterations saved. mean se_mean sd 2.5% 25% 50% 75% The post Stan...

Read more »

Spearman’s Rho

August 30, 2012
By

Spearman’s Rho Rank Correlation There are generally three types of correlation that a researcher may encounter: Pearson’s r, Kendall’s Tau, and Spearman’s Rho.  They each have their own uses and applications depending on the da...

Read more »

Three ways of visualizing the growth of Walmart

August 30, 2012
By
Three ways of visualizing the growth of Walmart

It's a wonderful thing when people make interesting data sets available to the public. When Thomas Jones wrote a paper in Econometrics about the growth of US retail giant Walmart, he made the data he collected about every Walmart store opening in history (location and date) available to the public. Since then, several people have used different techniques to...

Read more »

A Stan is Born

August 30, 2012
By

Stan 1.0.0 and RStan 1.0.0 It’s official. The Stan Development Team is happy to announce the first stable versions of Stan and RStan. What is (R)Stan? Stan is an open-source package for obtaining Bayesian inference using the No-U-Turn sampler, a variant of Hamiltonian Monte Carlo. It’s sort of like BUGS, but with a different language The post A...

Read more »

Making matrices with zeros and ones

August 30, 2012
By

So I was trying to figure out a fast way to make matrices with randomly allocated 0 or 1 in each cell of the matrix. I reached out on Twitter, and got many responses (thanks tweeps!). Here is the solution I came up with. See if you can tell why it...

Read more »

Another Great Google Summer of Code 2012 R Project

August 30, 2012
By
Another Great Google Summer of Code 2012 R Project

Tradeblotter announced the very nice features that will be added to the PerformanceAnalytics package as a result of the Google Summer of Code (GSOC) 2012 project: “…Matthieu commenced to produce dozens of new functions, extend several more existin...

Read more »