Forensic Accounting: Cohort Analysis

This is part four in a series on applying forensic accounting techniques to SQL and R. Mr. Keynes' Aggregates Conceal the Most Fundamental Mechanisms of Change In the last post, we focused on high-level aggregates to gain a basic understanding of our data. We saw some suspicious results but couldn't say much more than "This…

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Forensic Accounting: Introduction and Case Study

This is part one in a series on applying forensic accounting techniques to SQL and R. Necessary Disclaimers Before I get started, I have some disclaimers I need to get out of the way. I am not a CPA. My wife is a CPA but I'm the one writing this so you get my interpretation,…

Course Reviews: Fundamentals of Bayesian Data Analysis in R

This is a review of Rasmus Baath's Fundamentals of Bayesian Data Analysis in R DataCamp course. I really enjoyed this course. Rasmus takes us through an intuitive understanding of Bayesian data analysis without introducing Bayes's Theorem until the 4th chapter. The best part is, that's not even a criticism: by the time he introduces the…

Course Reviews: Writing Functions in R

This is a review of Hadley and Charlotte Wickham's DataCamp course entitled Writing Functions in R. Wickham and Wickham (borther and sister) do a great job of introducing some of the concepts of functional programming in R. The first chapter is a refresher on some of the basic program structures in R. From there, they…

Solving Naive Bayes With R

This is part four in a series on classification with Naive Bayes. Classification Of Features With R So far, we've walked through the Naive Bayes class of algorithms by hand, learning the details of how it works. Now that we have a good understanding of the mechanics at that level, let's let the computer do…

R Training In Redmond

I had to wait until this was official, but the long wait is over: I am giving my full-day R training in Redmond, Washington on Friday, February 8th. Tickets are priced at $125 for a jam-packed day full of learning and excitement and a little bit of snark hosted on Microsoft's Redmond campus. Course Description…

Text Classification By Hand With Naive Bayes

This is part three in a series on classification with Naive Bayes. Last Time On...The People's Court In our last post, we learned the math behind Naive Bayes and felt sorry for Nate Barkerson, the quarterback with Derek Anderson's acccuracy, Matt Barkley's scrambling abilities, and Nate Peterman's innate ability to throw the ball to the…

Solving Naive Bayes By Hand

This is part two in a series on classification with Naive Bayes. Learning Naive Bayes Through Repeated Interceptions On the whole, the Naive Bayes class of algorithms tends to be pretty easy to understand, which is a part of that class's popularity. So let's see how easy it really is by solving a problem with…

Classification With Naive Bayes: An Introduction

This is part one in a series on classification with Naive Bayes. What Is Naive Bayes? Let me fix that right away: Naive Bayes isn't a thing; it's a class of things. You do realize that collective nouns are typically referred to in the singular, right? You probably shouldn't do editorializing in the headings, me.…

R Training In Cleveland CANCELLED

UPDATE Unfortunately, the R training has been cancelled due to venue limitations. I'll still be at SQL Saturday Cleveland but will not be able to give my full-day training. To the tens of thousands of people (that estimate might be slightly high) who signed up, SQL Saturday Cleveland crew will be in touch. I've taken…