March 2014

WrightMap Tutorial – Part 2

March 24, 2014 | R Snippets for IRT

Plotting Multidimensional & Polytomous Models Remember: you can find the other parts of the tutorial here: Part 1: Plotting Unidimensional Dichotomous Models Part 3: Using Conquest Output & Making Thresholds Multidimensional models In Part 1, we reviewed how to install the package from GitHub and how to customize unidimensional and dichotomous models. Now in Part 2, ...
[Read more...]

Free eBook on Big Data and Data Science

March 24, 2014 | David Smith

The fine folks behind the Big Data Journal have just published a new e-book Big Data: Harnessing the Power of Big Data Through Education and Data-Driven Decision Making. (Note: Adobe Flash is required to view the e-book.) In the eBook, you'll find the following technical papers on the topics of ... [Read more...]

Hack, a template for improving code reliability

March 24, 2014 | Derek Jones

My sole prediction for 2014 has come true, Facebook have announced the Hack language (if you don’t know that HHVM is the Hip Hop Virtual Machine you are obviously not a trendy developer). This language does not follow the usual trend in that it looks useful, rather than being fashion ... [Read more...]

Image CGI with R

March 24, 2014 | BioStatMatt

I received an email recently with a question about using R in the common gateway interface (CGI) framework to create and pass image data to the web browser. I posted to stackoverflow about this some time ago, but had forgotten the details. The trouble is that R's graphics devices only ... [Read more...]

R jobs (March 24th)

March 24, 2014 | Tal Galili

Earlier this month I have announced the launch of R-users.com, a new R jobs website. My intention is to post around twice a month on new R jobs posted on the website. You are [Read more...]

MCMC on zero measure sets

March 23, 2014 | xi'an

Simulating a bivariate normal under the constraint (or conditional to the fact) that x²-y²=1 (a non-linear zero measure curve in the 2-dimensional Euclidean space) is not that easy: if running a random walk along that curve (by running a random walk on y and deducing x as x²=y²+1 ... [Read more...]

Random Love

March 23, 2014 | aschinchon

Anyone who considers arithmetical methods of producing random digits is, of course, in a state of sin (John von Newman) Ms. Positive and Mr. Negative live in a one-dimensional world and are falling in love. But beginnings are not always easy. They have a big problem: none of them like ... [Read more...]

Going viral with R’s igraph package

March 23, 2014 | Ryan Walker

R's igraph package provides a simple and flexible set of utilities for working with graphs.  In this post, we'll use this package to animate the simulated spread of a disease through a network. Graphs A graph is just a collection of nodes joined by edges: require(igraph)# Specify an undirected ... [Read more...]

ThinkToStartR package

March 23, 2014 | julianhi

***ALPHA*** I just started to work on my new package for this blog. This R package will include the code of all my tutorials and will make it accessible with easy function calls. Install To install the ALPHA version of the package open up R and use: Usage In this ... [Read more...]

Create Twitter Wordcloud with Sentiments

March 23, 2014 | julianhi

You can use this tutorial in the ThinkToStartR package with: ThinkToStart(“SentimentCloud”,”KEYWORD”,# of tweets,”DATUMBOX API KEY”) Hey everybody, some days ago I created a wordcloud filled with tweets of a recent german news topic. And a lot of people asked me if I have some code how I ... [Read more...]

Plotting forward curves with R

March 23, 2014 | édouard

I wanted to have an idea of the general form of the forward curve for London ICE gasoil futures contracts along the year. The R code below plot a forward curve for each month throughout the time series. Data were … Continue reading → [Read more...]

Data Transfer Advice From Francis Smart

March 23, 2014 | Dave Giles

I always enjoy reading the posts by Francis Smart on his Econometrics by Simulation blog. A couple of days ago he wrote a nice piece titled, "It is Time for RData Files to Become the Standard for Data Transfer".  Francis made some very nice points about the handling of large ... [Read more...]

Distribution Kinetics in JAGS

March 23, 2014 | Wingfeet

Chapter 19 of Rowland and Tozer (Clinical pharmacokinetics and pharmacodynamics, 4th edition) has distribution kinetics. I am examining problem 3. It is fairly easy, especially since essentially all formulas are on the same page under 'key relationships'. The only difficulty is that the formulas are symmetrical in λ1, c1 and λ2, c2 and they ... [Read more...]
1 2 3 4 5 6 … 15

Copyright © 2022 | MH Corporate basic by MH Themes

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)