Capital Bikeshare has provided almost 15 million bike rides across the greater Washington, DC, area over the six years it has been in existence. That's a lot of happy commuters and tourists avoiding the gnarly DC traffic and the depths of the Washingt... [Read more...]

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I’ve recently been thinking about the role statistics can play in answering questions. I think the it came up on the NSSD podcast a few weeks ago. Basically, problems can be divided into three classes: those that don’t need statistics because the answer is obvious (problems without much ... [Read more...]

Taking a look at the Denver crime data. Starting at exploratory and hoping to get some deeper insights later on. [Read more...]

A theme that comes up fairly regularly on X validated is the production of a sample with given moments, either for calibration motives or from a misunderstanding of the difference between a distribution mean and a sample average. Here are some entries on that topic: How to sample from a ... [Read more...]

Optical character recognition (OCR) is the process of extracting written or typed text from images such as photos and scanned documents into machine-encoded text. The new rOpenSci package tesseract brings one of the best open-source OCR engines to R. This enables researchers or journalists, for example, to search and analyze ... [Read more...]

Practical Data Science with R, Zumel, Mount; Manning 2014 is a book Nina Zumel and I are very proud of. I have written before how I think this book stands out and why you should consider studying from it. Please read on for a some additional comments on the intent of ... [Read more...]

This is a great time to have tools to do data analysis.  Microsoft is now allowing evaluations of its new SQL Server.  This new SQL Server can now be deployed to a Linux OS environment.  This is big news especially for those that have followed this blog through the years.... [Read more...]

Microsoft Cognitive Services is a set of cloud-based machine-intelligence APIs that you can use to extract structured data from complex sources (unstructured text, images, video and audio), and add "AI" type features to applications. A good example is the "Seeing AI" glasses in the video below: the image descriptions, emotion ... [Read more...]

.fusion-fullwidth-1 { padding-left: px !important; padding-right: px !important; }by Nathan Stephens How R Enters Through the Back Door In many organizations, R enters thro... [Read more...]

Guest post by Jonathan Sidi, Metrum Research Group ggplot2 has become the standard of plotting in R for many users. New users, however, may find the learning curve steep at first, and more experienced users may find it challenging to keep track of all the options (especially in the theme!). ... [Read more...]

Introduction In a recent blog post, I introduced the new R package, manhattanly, which creates interactive manhattan and Q-Q plots using the plotly.js engine. In the latest CRAN release, you can also create volcano plots. In this post, I describe how to create interactive volcano plots using the manhattanly ... [Read more...]

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mapmate has now been updating from version 0.1.0 to 0.2.0 on Github. The key change is the incorporation of new functions, help docs and code examples focused on network maps, which is a more complex map type not previously covered. The new tutorial content below provides a a couple basic code examples ... [Read more...]

[For this exercise, first write down your answer, without using R. Then, check your answer using R.] Answers to the exercises are available here. Exercise 1 Consider two vectors, x, y x=c(4,6,5,7,10,9,4,15) y=c(0,10,1,8,2,3,4,1) What is the value of: x*y Exercise 2 Consider two vectors, a, b a=c(1,2,4,5,6) b=... [Read more...]

Curious which R packages your colleagues and the rest of the R community are using? Thanks to Rdocumentation.org you can now see for yourself! Rdocumentation.org aggregates R documentation and download information from popular repositories like CRAN, B... [Read more...]

In case you missed them, here are some articles from October of particular interest to R users. A brief summary of the R 3.3.2 release. "Data Science with SQL Server 2016", a free E-book featuring several in-depth R examples, is now available for download. The ReporterRs package makes it easy to insert ... [Read more...]

These plug-ins enhance statistical graphical user interface by extending new menus to statistical package provided by Rcmdr. While the original GUI was created for a basic statistics calculations, enabling of extensions (or plug-ins) has greatly enhanced the possible use and scope of this software. Installing these plug-ins is quite easy. ... [Read more...]

When the relation between two variables x and y is not linear and if there exists a curvilinear relationship (which can be observed by means of a scatter plot between x and y), then one can perform curve fitting or polynomial regression between these two variables. To know the details ... [Read more...]

Sometimes data may not be available in the csv file in the required format. Consider the following csv file, whose details are as follows – Four different treatments were given to four different groups of patients. Random samples of size 7 were selected from each group and blood levels of Hb percentage ... [Read more...]