Blog Archives

New Version of caret on CRAN

January 5, 2015
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New Version of caret on CRAN

A new version of caret is on CRAN. Some recent features/changes: The license was changed to GPL >= 2 to accommodate new code from the GA package. New feature selection functions gafs and safs were adde...

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Comparing the Bootstrap and Cross-Validation

December 8, 2014
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Comparing the Bootstrap and Cross-Validation

This is the second of two posts about the performance characteristics of resampling methods. The first post focused on the cross-validation techniques and this post mostly concerns the bootstrap. Recall from the last post: we have some simulations to evaluate the precision and bias of these methods. I simulated some regression data (so that I know the real...

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Comparing Different Species of Cross-Validation

December 2, 2014
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Comparing Different Species of Cross-Validation

This is the first of two posts about the performance characteristics of resampling methods. I just had major shoulder surgery, but I've pre-seeded a few blog posts. More will come as I get better at one-handed typing. First, a review: Resampling methods, such as cross-validation (CV) and the bootstrap, can be used with predictive models to get estimates of model...

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Solutions on github

November 12, 2014
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See this page. We're not done with them all but chapter 3 and 4 are there and the regression chapters are not too far behind. The Rnw files (using knitr LaTeX) are there along with the corresponding pdf files. You may have better solutions than ...

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Some Thoughts on “Do we Need Hundreds of Classifiers to Solve Real World Classification Problems?”

November 11, 2014
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Sorry for the blogging break. I’ve got a few planned for the next few weeks based on some work I’ve been doing. In the meantime, you should check out “Do we Need Hundreds of Classifiers to Solve Real World Classification Problems?” by Manuel Fernandez-Delgado at JMLR. They took a large number of classifiers and ran them against...

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useR! 2014 Highlights

July 3, 2014
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My talk went well; here are the slides and a link to the paper pre-print. Hadley Wickham gave an excellent tutorial on dplyr. Based on the talk I saw, I think I will take the data sets from the book and make some public visualizations on the Plotly we...

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New caret version with adaptive resampling

May 28, 2014
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New caret version with adaptive resampling

A new version of caret is on CRAN now. There are a number of bug fixes: A man page with the list of models available via train was added back into the package. See ?models. Thoralf Mildenberger found and fixed a bug in the variable importance calcu...

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A Tutorial and Talk at useR! 2014 [Important Update]

May 12, 2014
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See the update below I'll be doing a morning tutorial at useR! at the end of June in Los Angeles. I've done this same presentation at the last few conferences and this will probably be the last time for this specific workshop. The tutorial outline is: Conventions in R Data splitting and estimating performance Data pre-processing Over-fitting and resampling Training and tuning tree...

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A Tutorial and Talk at useR! 2014

May 7, 2014
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I'll be doing a morning tutorial at useR! at the end of June in Los Angeles. I've done this same presentation at the last few conferences and this will probably be the last time for this specific workshop. I will be including a copy of the book for ...

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Bay Area RUG Talk on 3/17

March 9, 2014
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I'm making my yearly pilgrimage to San Fransico to teach at PAW. I'll also be giving a short talk at the Bay Area R Users Group on model tags in the caret package and the code that produced this interactive plot. It is at 7:00 PM on Monday March 17...

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