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Mad (Data) Scientist | Musings, useful code etc. on R and data science | matloff.wordpress.com Reviews
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Heteroscedasticity in Regression — It Matters! | Mad (Data) Scientist
https://matloff.wordpress.com/2015/06/07/heteroscedasticity-in-regression-it-matters
Heteroscedasticity in Regression — It Matters! June 7, 2015. R’s main linear and nonlinear regression functions, lm(). Report standard errors for parameter estimates under the assumption of. A fancy word for a situation that rarely occurs in practice. The assumption is that the (conditional) variance of the response variable is the same at any set of values of the predictor variables. So, confidence intervals and p-values calculated by lm(). Packages in the functions hccm(). And outputs the estimated cov...
CACM Highlights R | Mad (Data) Scientist
https://matloff.wordpress.com/2015/07/23/cacm-highlights-r
July 23, 2015. The Association for Computing Machinery is the main professional organization for computer science, largely for academia but still with a broad membership. ACM publishes a number of journals, most of them for research but its flagship publication is a magazine, the. Communications of the ACM. The current issue of the CACM includes an article, “Bringing Big Data to the Big Tent,”. I do believe that there should be more structure to CRAN. The Task Views are nice, but are often nowhere ne...
Update on Snowdoop, a MapReduce Alternative | Mad (Data) Scientist
https://matloff.wordpress.com/2015/05/29/update-on-snowdoop-a-mapreduce-alternative
Update on Snowdoop, a MapReduce Alternative. May 29, 2015. The idea of Snowdoop is to. Retain the idea of Hadoop/Spark to work on top of distributed file systems (“move the computation to the data rather than vice versa”). Work purely in R, using familiar constructs. Avoid using Java or any other external language for infrastructure. Sort data only if the application requires it. Which also contains other parallel computation utilities, such as a debugging aid for the cluster portion of R’s parallel.
Macros in R | Mad (Data) Scientist
https://matloff.wordpress.com/2015/06/04/macros-in-r
June 4, 2015. In programming, sometimes it’s useful to write a. Rather than a function. (Don’t worry if you’ve never heard the term before.) In this post, I’ll give an example of use of macros in R. using the gtools. I wanted to write some utility code to help me reuse my earlier R commands during an interactive R session. Most (though not all) of what I wanted is already provided in the excellent R user interface systems such as ESS. Choose one of the recent commands for re-execution. In which to goal i...
My New Book and Other Matters | Mad (Data) Scientist
https://matloff.wordpress.com/2015/05/22/my-new-book-and-other-matters
My New Book and Other Matters. May 22, 2015. I haven’t posted for a while, so here are some news items:. Parallel Computation for Data Science. Will be out in June or July. I believe it will be useful to anyone doing computationally intensive work. After a few months being busy with the book and other things, I have returned to my Snowdoop project and my associated package, partools. I recently gave a talk on Snowdoop. To the Berkeley R Group, and you will be hearing more here on this blog. Professor Mat...
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tidewateranalytics.wordpress.com
March 2016 Items of Interest | Tidewater Analytics
https://tidewateranalytics.wordpress.com/2016/03/01/march-2016-items-of-interest
Promoting data science and analytics in the greater Hampton Roads area. February 2016 Items of Interest. March 2016 Items of Interest. March 1, 2016. Machine Learning Working Group. Saturday, 05 March. 3:00 pm at 757 Creative Space, 259 Granby St. Suite 250, downtown Norfolk. This is a hands-on working group for those interested in working with the underlying algorithms and code that will be discussed at the Tuesday night Tidewater Analytics meeting. Tuesday, 08 March. 757 Python User Group. A Data Scien...
An adequate analytical approximation to the standard normal CDF | It's chancy.
https://itschancy.wordpress.com/2013/12/21/an-adequate-analytical-approximation-of-the-standard-normal-cdf
Stochastic musings of a biostatistician. December 21, 2013. An adequate analytical approximation to the standard normal CDF. It’s not great, but, as my mother-in-law sometimes says, it’ll do in the dark:. Next post →. Laurie Davies and betting on adequacy. How “Severity, part one” got Mayo wrong (and a preview of “Two Severities”). When does Bayesian inference shatter? An adequate analytical approximation to the standard normal CDF. Andrew MacFie on Blogging Agenda. A sense that more is possible. I remem...
Thesis submitted, articles in press | Matt Moores
https://mattstats.wordpress.com/2015/02/21/thesis-submitted-articles-in-press
Thesis submitted, articles in press. February 21, 2015. Some of my thesis papers have recently appeared online:. 8220;Pre-processing for approximate Bayesian computation in image analysis”. Moores, Drovandi, Mengersen and Robert (2015). 1): 23-33. DOI: 10.1007/s11222-014-9525-6. 8220;An external field prior for the hidden Potts model, with application to cone-beam computed tomography”. Moores, Hargrave, Deegan, Poulsen, Harden and Mengersen (2015). Computational Statistics and Data Analysis. July 12, 2016.
Graduation Ceremony | Matt Moores
https://mattstats.wordpress.com/2015/07/29/graduation-ceremony
July 29, 2015. I was very glad that I was able to attend my PhD graduation ceremony in Brisbane last week. My extended family were there to cheer me on, as well as both of my supervisors and my dear friend, Kal. Out of 28 doctorates there were a dozen from maths, including four statisticians. Unfortunately none of us snagged an Outstanding Doctoral Thesis Award, but it was nice to be nominated! Brisbane QLD, Australia. From → Uncategorized. Leave a Reply Cancel reply. Enter your comment here. June 3, 2016.
Talk at QUT on Friday August 7 | Matt Moores
https://mattstats.wordpress.com/2015/08/06/talk-at-qut-on-friday-august-7
Talk at QUT on Friday August 7. August 6, 2015. Lorentzian mixture model for Raman spectroscopy. Matt Moores (University of Warwick, UK). Friday 7 August 2015. 3:00pm – 4:00pm. O603, Gardens Point Campus, Queensland University of Technology. This is joint work with Mark Girolami. Warwick), Kirsten Gracie. Brisbane QLD, Australia. From → Functional Data. Talk at Oxford on Friday March 11 Matt Moores. Bayesian modelling and quantification of Raman spectroscopy Matt Moores. Leave a Reply Cancel reply. Ingma...
Political Reality 102 | Upon Closer inspection
https://normsaysno.wordpress.com/2016/12/13/political-reality-102
December 13, 2016. December 13, 2016. I’ve received a number of reader responses, public and private, to my posting yesterday. In which I pointed out that Congress responds to pressure, pure and simple, and does generally NOT respond to well-reasoned arguments offered without pressure. But these readers point out the obvious: If they speak out publicly, they are subject to blacklisting by potential employers. I myself have mentioned this in the past. He didn’t get the job. Educate journalists and talk sh...
Trump Surprises Tech Leaders on H-1B (?) | Upon Closer inspection
https://normsaysno.wordpress.com/2016/12/16/trump-surprises-tech-leaders-on-h-1b
Trump Surprises Tech Leaders on H-1B (? Trump Surprises Tech Leaders on H-1B (? December 16, 2016. In a post here more than a year ago. I lauded Donald Trump’s posted platform policy on the H-1B work visa and related issues. But two days later, Trump clarified his position, ruining the effect of his earlier policy completely, so I posted a followup. Ending with the statement, “Trump’s a chump.” What did I object to so strongly? H-1B Reform Proposal — a Great Start or a Cruel Ruse? December 16, 2016 at 8:...
A Second WSJ Article on Foreign Students | Upon Closer inspection
https://normsaysno.wordpress.com/2016/06/07/a-second-wsj-article-on-foreign-students
A Second WSJ Article on Foreign Students. A Second WSJ Article on Foreign Students. June 7, 2016. June 7, 2016. Back on March, I made a post here. Titled, “U.S. Universities Souring on Students from China? 8221; commenting on a. Titled “Heavy Recruitment of Chinese Students Sows Discord on U.S. Campuses.” Today’s. Ran what amounts to a followup piece. 8220;Foreign Students Seen Cheating More Than Domestic Ones.”(The article is behind a pay wall, but is summarized here. We do have some best and brightest ...
The Atlantic Explains H-1B | Upon Closer inspection
https://normsaysno.wordpress.com/2016/12/03/the-atlantic-explains-h-1b
The Atlantic Explains H-1B. The Atlantic Explains H-1B. December 3, 2016. December 3, 2016. I actually am a subscriber to. Specifically, there is the November 30 article. 8220;Not All Immigrant Labor Is Cheap Labor,” by Alexia Hernandez Campbell. Right off the bat, note that. This is a funded article. Essentially an infomercial. Can it be that such an august, 159-year-old publication such as. Sad but true. And the sponsor, the Emerson Collective. But let’s take a look at this new one. It of course was no...
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Mad (Data) Scientist | Musings, useful code etc. on R and data science
Partools: a Sensible R Package for Large Data Sets. August 5, 2015. As I mentioned recently, the new, greatly extended version of my partools. Package is now on CRAN. The current version on CRAN is 1.1.3, whereas at the time of my previous announcement it was only 1.1.1. Note that Unix is NOT required.). It is my contention that for most R users who work with large data, partools. 8212; or methods like it — is. A better, simpler, far more convenient approach than Hadoop and Spark. Just uses ordinary R.
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