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by Hong Ooi, Sr. Data Scientist, Microsoft Version 0.90 of the dplyrXdf package has just been released. dplyrXdf is a package that brings dplyr pipelines and data transformation verbs to Microsoft R Server’s xdf files. This version includes several changes, mostly to address performance and efficiency concerns, which I’ll ... [Read more...]

Brief explanation Structural Equation Modelling (SEM) is a state of art methodology and fulfills much of broader discusion about statistical modeling, and allows to make inference and causal analysis. SEM models are regression models braodly used in Marketing, Human Resources, Biostatistics and Medicine, revealing their flexibility as analytical tool. Despite ... [Read more...]

Five different sources of error When it comes to time series forecasts from a statistical model we have five sources of error: Random individual errors Random estimates of parameters (eg the coefficients for each autoregressive term) Uncertain... [Read more...]

tl;dr: although I use R every day and love it, doing mathematical programming using Julia is much simpler and more flexible than anything I know that is currently available in R.Recently I have learned that Iain Dunning and Joey Huchette and Miles Lubin have received 2016 INFORMS Computing Society ... [Read more...]

It’s been about a month since the U.S. presidential election, with Donald Trump’s victory over Hillary Clinton coming as a surprise to most. Reddit user Jason Baumgartner collected and published every submission and comment posted to Reddit on the day of (and a bit surrounding) the U.... [Read more...]

It’s been about a month since the U.S. presidential election, with Donald Trump’s victory over Hillary Clinton coming as a surprise to most. Reddit user Jason Baumgartner collected and published every submission and comment posted to Reddit on the ... [Read more...]

In case you missed them, here are some articles from November of particular interest to R users. Microsoft R Open 3.3.2, based on R 3.3.2, has been released for Windows, Mac and Linux. A new, free course on EdX focuses on the big-data extensions of Microsoft R Server. Using ggplot2 to create ... [Read more...]

This is a short post for those looking to test out Amazon Athena with R. Amazon makes Athena available via JDBC, so you can use RJDBC to query data. All you need is their JAR file and some setup information. Here’s how to get the JAR file to the ... [Read more...]

The basic functions used for exploring a datframe in R. [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 Create a function that given a data frame and a vector, will add a the vector (if the vector length match with the rows number ... [Read more...]

The R Community is powered by open course contributions from a wide variety of individuals. Anyone can create and distribute R packages that benefit the R community and make it easier for R users all over the world to work with their code. Some R use... [Read more...]

After a successful EARL London in September of this year (see here and here) it was Boston’s turn to shine. This is only the second time this conference has run, yet its quality of speakers is at par with London. … Continue reading → [Read more...]

I’ve added a couple of new functions to the forecast package for R which implement two types of cross-validation for time series.K-fold cross-validation for autoregression The first is regular k-fold cross-validation for autoregressive models. Although cross-validation is sometimes not valid for time series models, it does work for ... [Read more...]

I’ve added a couple of new functions to the forecast package for R which implement two types of cross-validation for time series. K-fold cross-validation for autoregression The first is regular k-fold cross-validation for autoregressive models. Although cross-validation is sometimes not valid for time series models, it does work for ... [Read more...]

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As you know, the composition of an Index changes over time and this scipt takes the Yahoo Finance page and retrieves all individual stock symbols for you and stores it in the tickers object.I had to update my R-Version to use the RCurl package - this is required as ... [Read more...]

Marijuana, Alcohol, and Other Drugs Continuing our Exploration of the Data After identifying the sources of crime growth, it’s time to investigate specific crime rates. This blog post addresses drug and alcohol crimes in Denver over the past few years. This is a very simplistic view because it will ... [Read more...]

A look into Denver crime data surrounding marijuana, alcohol, and other drugs using R programming. [Read more...]