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Data Community DC and District Data Labs are hosting a Supervised Machine Learning with R workshop on Saturday April 30th. Come out and learn about R's capabilities for regression and classification, how to perform inference with these models, and how to use out-of-sample evaluation methods for your models! [Read more...]

Tom Schmitt April 12, 2016 As discussed on page 308 and illustrated on page 312 of Schmitt (2011), a first essential step in Factor Analysis is to determine the appropriate number of factors with Parallel Analysis in R. The data consists of 26 psychological tests administered by Holzinger and Swineford (1939) to 145 students and Continue Reading.. The ... [Read more...]

I mapped out the USA homelessness rate in my last post as a challenge and noted at the end that it would be interesting to do the same for Australia. That was the first comment I received in person, too....Continue Reading → [Read more...]

We’re in the fantastic situation where lots of people are using Travis-CI to test their R packages or use it to test and deploy their analytics/ documentation / anything really. It’s popularity has been having a negative side-effect recently though! GitHub rate limits API access to 5000 requests per hour ... [Read more...]

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In part 1 I showed how to grab data from the forecast.io, now that we have all of that I want to use it to investigate the effects of weather on accidents. First, I realised after playing around a little that one possible way of doing this was as follo... [Read more...]

Time ago @hrbrmstr show how to replicate a visualization made by New York Times with R. The @nytgraphics folks are spiffy.so is #rstats https://t.co/zc1gIx6cyE https://t.co/XAmVPDLfC7 #tigrisviridisggplot pic.twitter.com/9ZK6wvYDnh— boB Rudis (@hrbrmstr) March 25, 2016 The result we hope is like ... [Read more...]

In part 1 I showed how to grab data from the forecast.io, now that we have all of that I want to use it to investigate the effects of weather on accidents. First, I realised after playing around a little that one possible way of doing this was as follows; ... [Read more...]

Buzzfeed's Peter Aldhous and Charles Seife broke a major news story last week: the US Federal Bureau of Investigation and Department of Homeland Security operate more than 200 small aircraft (mainly Cessnas and some helicopters) which routinely circle various sites near US cities, presumably to gather data with onboard cameras and ... [Read more...]

by Shaheen Gauher, PhD, Data Scientist at Microsoft In machine learning, the problem of classification entails correctly identifying to which class or group a new observation belongs, by learning from observations whose classes are already known. In what follows, I will build a classification experiment in Azure ML Studio to ... [Read more...]

You can find registration information and agenda details on the conference website.  Or you can go directly to the Cvent registration page.Note that registration fees will increase by 50% at the end of early regi... [Read more...]

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We are very pleased to announce that a new release of simmer, the Discrete-Event Simulator for R, is on CRAN. There are quite a few changes and fixes, with the support of preemption as a star new feature. Check out the complete set of release notes here. Let’s simmer ... [Read more...]

You have been lied to. By me. I taught once a programming class and introduced my students to the notion of an unbiased estimator of the variance of a population. The problem can be stated as follows: given a set of observations $(x_1, x_2, …, x_n)$, what can you say ... [Read more...]