Blog Archives

Update on Polynomial Regression in Lieu of Neural Nets

July 1, 2018
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Update on Polynomial Regression in Lieu of Neural Nets

There was quite a reaction to our paper, “Polynomial Regression as an Alternative to Neural Nets” (by Cheng, Khomtchouk, Matloff and Mohanty), leading to discussions/debates on Twitter, Reddit, Hacker News and so on. Accordingly, we have posted a revised version of the paper. Some of the new features: Though originally we had made the disclaimer … Continue reading Update...

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Neural Networks Are Essentially Polynomial Regression

June 20, 2018
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You may be interested in my new arXiv paper, joint work with Xi Cheng, an undergraduate at UC Davis (now heading to Cornell for grad school); Bohdan Khomtchouk, a post doc in biology at Stanford; and Pete Mohanty,  a Science, Engineering & Education Fellow in statistics at Stanford. The paper is of a provocative nature, … Continue reading Neural...

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Women in R

June 8, 2018
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Last week I gave one of the keynote addresses at R/Finance 2018 in Chicago. I considered it an honor and a pleasure to be there, both because of the stimulating intellectual exchange and the fine level of camaraderie and hospitality that prevailed. I mentioned at the start of my talk that the success of this … Continue reading Women...

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Xie Yihui, R Superstar and Mensch

February 23, 2018
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Xie Yihui, R Superstar and Mensch

Yesterday a friend told me, “Yihui has written the most remarkably open blog post, and you’ve got to read it.” I did and it was. Though my post here is not about R per se, it is about a great contributor to R, our Yihui, Dr. of Statistics and (according to him) Master of Procrastination. … Continue reading Xie...

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Regression Analysis — What You Should’ve Been Taught But Weren’t, and Were Taught But Shouldn’t Have Been

September 20, 2017
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Regression Analysis — What You Should’ve Been Taught But Weren’t,  and Were Taught But Shouldn’t Have Been

The above title was the title of my talk this evening at our Bay Area R Users Group. I had been asked to talk about my new book, and I presented four of the myths that are dispelled in the book. Hadley also gave an interesting talk, “An introduction to tidy evaluation,” involving some library … Continue reading Regression...

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cdparcoord: Parallel Coordinates Plots for Categorical Data

September 4, 2017
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cdparcoord: Parallel Coordinates Plots for Categorical Data

My students, Vincent Yang and Harrison Nguyen, and I have developed a new data visualization package, cdparcoord, available now on CRAN. It can be viewed as an extension of the freqparcoord package written by a former grad student, Yingkang Xie and myself, which I have written about before in this blog. The idea behind both … Continue reading cdparcoord:...

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Wrong on an Astronomical Scale

August 20, 2017
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Wrong on an Astronomical Scale

I recently posted an update regarding our R package revisit, aimed at partially remedying the reproducibility crisis, both in the sense of (a) providing transparency to data analyses and (b) flagging possible statistical errors, including misuse of significance testing. One person commented to me that it may not be important for the package to include … Continue reading Wrong...

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Update on Our ‘revisit’ Package

August 16, 2017
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Update on Our ‘revisit’ Package

On May 31, I made a post here about our R package revisit, which is designed to help remedy the reproducibility crisis in science. The intended user audience includes reviewers of research manuscripts submitted for publication, scientists who wish to confirm the results in a published paper, and explore alternate analyses, and members of the … Continue reading Update...

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Understanding Overhead Issues in Parallel Computation

July 29, 2017
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Understanding Overhead Issues in Parallel Computation

In my talk at useR! earlier this month, I emphasized the fact that a major impediment to obtaining good speed from parallelizing an algorithm is systems overhead of various kinds, including: Contention for memory/network. Bandwidth limits — CPU/memory, CPU/network, CPU/GPU. Cache coherency problems. Contention for I/O ports. OS and/or R limits on number of sockets … Continue reading Understanding...

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My Presentation at useR! 2017, Etc.

July 8, 2017
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My Presentation at useR! 2017, Etc.

I gave a talk titled, “Parallel Computation in R:  What We Want, and How We (Might) Get It,” at last week’s useR! 2017 conference in Brussels. You can view my slides here, and I think the conference organizers said the videos would be placed online, not sure of that though. The goal of the talk … Continue reading My...

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