Blog Archives

Boston R User Group Talk [UPDATE]

March 4, 2016
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Boston R User Group Talk [UPDATE]

I'll be giving a talk on Boston R user Group on Thursday March 10th at 6:00 PM. The talk will be on rule-based regression models. The image above is the training/test set split for the data that I'll be us...

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Central Iowa R User Group Talk [Updated]

January 18, 2016
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Central Iowa R User Group Talk [Updated]

I'll be giving a talk ("Applied Predictive Modeling") to the Central Iowa R User Group on Thursday night at 6:00 PM to 8:00 PM (CST). It looks like it will be broadcast live on YouTube. The link is http://...

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In Search Of…

December 13, 2015
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In Search Of…

Rafael Ladeira asked on github: I was wondering why it doesn't implement some others algorithms for search for optimal tuning parameters. What would be the caveats of using a genetic algorithm , for instance, instead of grid or random search? Do y...

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C5.0 Class Probability Shrinkage

September 14, 2015
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C5.0 Class Probability Shrinkage

(The image above has nothing do to with this post. It does, however, show the prize that my daughter won during a recent vacation to Virginia and how I got it back home). I was recently asked to explain a potential disconnect in C5.0 between the class probabilities shown in the terminal nodes and the values generated...

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Feature Engineering versus Feature Extraction: Game On!

August 3, 2015
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Feature Engineering versus Feature Extraction: Game On!

"Feature engineering" is a fancy term for making sure that your predictors are encoded in the model in a manner that makes it as easy as possible for the model to achieve good performance. For example, if your have a date field as a predictor and there are larger differences in response for the weekends versus the weekdays, then...

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New caret Version (6.0-52)

July 22, 2015
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A new version of caret (6.0-52) is on CRAN. Here is the news file but the Cliff Notes are: sub-sampling for class imbalances is now integrated with train and is used inside of standard resampling. There are four methods available right now: up- and...

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Slides from recent talks

April 21, 2015
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Slides from recent talks

I've been buried in work lately but thought I'd share the slides from two recent talks. The first is from the Bay Area RUG. Since someone filmed the talks, I was waiting to post the slides. The video of my t...

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A Talk and Course in NYC Next Week

February 13, 2015
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A Talk and Course in NYC Next Week

I'll be giving talk on Tuesday February 17 (7:00PM-9:00PM) that will be an overview of predictive modeling. It will not be highly technical and here is the current outline: "Predictive modeling" definition Some example applications A short overview and example How is this different from what statisticians already do? What can drive choice of methodology? Where should we focus our efforts? The location...

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Simulated Annealing Feature Selection

January 12, 2015
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Simulated Annealing Feature Selection

As previously mentioned, caret has two new feature selection routines based on genetic algorithms (GA) and simulated annealing (SA). The help pages for the two new functions give a detailed account of the options, syntax etc. The package already has functions to conduct feature selection using simple filters as well as recursive feature elimination (RFE). RFE...

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Regression Solutions Available

January 8, 2015
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Regression Solutions Available

The github page for the APM exercises has been updated with three new files for Chapters 6-8 (the section on regression). The classifications section is in-progress. Here's one of our fancy-pants graphs:

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