Blog Archives

Early draft of our “Feature Engineering and Selection” book

May 14, 2018
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Early draft of our “Feature Engineering and Selection” book

Kjell...

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tidyposterior slides

May 4, 2018
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tidyposterior slides

tidyposterior...

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New Workshop in Washington DC (August)

April 10, 2018
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New Workshop in Washington DC (August)

I'll...

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Tidy Resampling Redux with Agricultural Economics Data

March 12, 2018
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Tidy Resampling Redux with Agricultural Economics Data

(No...

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RStudio 2018 Conference Presentation and Materials

March 4, 2018
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RStudio 2018 Conference Presentation and Materials

We've...

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While you wait for that to finish, can I interest you in parallel processing?

January 17, 2018
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While you wait for that to finish, can I interest you in parallel processing?

caret has been able to utilize parallel processing for some time (before it was on CRAN in October 2007) using slightly different versions of the package. Around September of 2011, caret started using the foreach package was used to "harmonize" the par...

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Lots of Package News

December 11, 2017
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Lots of Package News

I've sent a...

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caret Cheatsheet

September 12, 2017
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caret Cheatsheet

...

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Nested Resampling with rsample

September 4, 2017
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Nested Resampling with rsample

A typical scheme for splitting the data when developing a predictive model is to create an initial split of the data into a training and test set. If resampling is used, it is executed on the training set where a series of binary splits is created. In rsample, we use the term analysis set for the data that...

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Do Resampling Estimates Have Low Correlation to the Truth? The Answer May Shock You.

April 23, 2017
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Do Resampling Estimates Have Low Correlation to the Truth? The Answer May Shock You.

One criticism that is often leveled against using resampling methods (such as cross-validation) to measure model performance is that there is no correlation between the CV results and the true error rate. Let's look at this with some simulated data. W...

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