While the feed from a newer github/jekyll blogging platform (patilv.github.io) is registered with blog aggregators, here are snippets of three posts that were recently published at the new site. Please click on the titles to visit the corresponding page. 1. Frequent Speakers at Ted and Word Cloud of ... [Read more...]

Do you remember the time when you switched from graphical statistical software to R? I did it eight years ago, and I had hard time doing even a simple regression analysis without constantly searching for help, it was a pain. In desperation I frequently cheated and went back to Statistica … ... [Read more...]

by Ilya Kipnis In this post, I will demonstrate how to obtain, stitch together, and clean data for backtesting using futures data from Quandl. Quandl was previously introduced in the Revolutions Blog. Functions I will be using can be found in my IK Trading package available on my github page. ... [Read more...]

We are getting close to useR!2014. I hope I'll see some of you at my tutorial about Rcpp11 in the morning. There are some other pretty useful tutorials as well, so no hard feeling if you don't come, but if you do want to know about modern R and C++, ... [Read more...]

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plenty of nationwide surveys collect information at the household-level, only the american housing survey (ahs) focuses on the physical structure rather than the inhabitants.  when asked to pick their favorite public-use file, urban planners, real... [Read more...]

I use a set of neuroimaging tools, but my language of choice is R. FSL, which is from the University of Oxford's Functional MRI of the Brain (FMRIB), and stands for FMRIB Software Library, is one tool I commonly use. I wrote some wrapper functions into an R package called ... [Read more...]

Let's say you have a whole lot of csv files in your working directory.  By some convenient act of divine grace they also happen to have the same column structures.  Reading them into R can be a slow matter as … Continue reading → [Read more...]

While Trend Vigor has potential on the long end (as seen in part III of this investigation here), as Andreas … Continue reading → [Read more...]

When discussing transformations in regression models, I usually briefly introduce the Box-Cox transform (see e.g. an old post on that topic) and I also mention local regressions and nonparametric estimators (see e.g. another post). But while I was working on my ACT6420 course (on predictive modeling, which is ... [Read more...]

R continues to rise in popularity.  Check out this article at RedMonk [Read more...]

The other week a user of ggtern ran into a problem where they wanted to use the limit_tern(...) functionality, however there were a few marginal points / paths that extended beyond the limiting region. Under normal circumstances, the standard ggtern behaviour is to strip these points, which can interfere with ... [Read more...]

Earlier this month, the results of the 15th annual KDnuggets Software Poll were released and R's popularity continues to grow. 38.5% of respondents reporting using open source R in the last 12 months, up from 37.4% in 2013. R was second only to RapidMiner in popularity, which was used by 44.2% of respondents to this ... [Read more...]

When building an online education start-up for R the number one criterion to meet is the following: identify an increasing interest in learning R online. Once this box is checked, it is time to start thinking of the second most important criterion: establish a teaching approach that makes people so ... [Read more...]

Do you find this plot fancy? If yes, you can find the code at the end of this article BUT if you spend a little time to read it thoroughly, you can learn how to create better ones. We would…Read more › [Read more...]

Sometimes when we create some nice functions which we want to show other people who don’t know R we can do two things. We can teach them R what is not easy task which also takes time or we can…Read more › [Read more...]

Text mining is currently a live issue in data analysis. Enoromus text data resourses on the Internet made it an important component of Big Data world. The potential of information hidden in the words is the reason why I find…Read more › [Read more...]

This is the bimonthly R Jobs post (for 2014-06-16), based on the R-bloggers’ sister website: R-users.com. If you are an employer who is looking to hire people from the [Read more...]

Continuing from last week, the aim is now to classify the stone flakes based on their various properties. Three methods are used. LDA is an obvious standard. A classification tree is both simple and visually appealing. Random forest as a complex method... [Read more...]

When plot with R (or some other software), it doesn’t bother you a lot for choosing colors if you have only several data series. For example, if I want to create a figure for 5 data series, I can choose red, green, dark green, blue and black. But what if ... [Read more...]