This is in response to Andrew Z’s post on R-Bloggers Friday about using recursion to calculate numbers in the Fibonacci sequence. http://heuristicandrew.blogspot.com/2014/12/fibonacci-sequence-in-r-and-sas.html I’ve re-written the author’s Fibonacci function here. The only really change is that this one is extended to … Continue reading → [Read more...]

To support auto complete in Emacs, we need to install the auto-complete extension. To activate auto complete, we need to load it at Emacs startup. Read More: 440 Words Totally [Read more...]

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In exercise 61.1 the problem is that the model has bad mixing. In the SAS manual the mixing is demonstrated after which a modified distribution is used to fix the model.In this post the same problem is tackled in R; MCMCpack, RJags, RStan and LaplaceDemon. MCMCpack has quite some mixing ... [Read more...]

Carl Jung was at least partially correct. We do tend to think in terms of the extremes as shown in this archetypal wheel with rulers versus outlaws and heroes versus caregivers at different ends of bipolar dimensions. Happily, we are not required to ac... [Read more...]

The choice of colors you use in a statistical graphic isn't just about making your chart look good: the colors you choose are often critical to interpretation. For example, you wouldn't want to use a scale like this to represent, say, average income on a map: That palette would be ... [Read more...]

The proliferation and participation in the marathon has increased substantially in recent years.  No longer is the distance an event reserved for the super-athletic, but at least in the US one can from many vantage points on highways or streets se... [Read more...]

Cool Prospect Theory Visualizer draws the curves for you. The post Visualize Prospect Theory appeared first on Decision Science News. [Read more...]

Because the Fibonacci sequence is simply defined by recursion, it makes for an elegant programming exercise. Here is one way to do it in SAS, and another way to do it in R. I've also included unit testing code to check that it works. Fibonacci sequence in SAS using a ... [Read more...]

Umph, that was a tough one. I spent ages figuring out how to do it correctly. I have a server running apache (on port 80) and shiny on port (say) 11111. Shiny has its own document root, and within this root, we have a shiny app, say, “example”. So to view this ... [Read more...]

Here's a little function to select data points in an open graphical device (ptlocator()). The function does a scaling of the x and y axes in order to give them equal weighting and remove the influence of differing units or ranges. The function then cal... [Read more...]

After that I began playing around with logistic regression. So far, none of my attempts at logistic regression have improved my score but I have some ideas for tomorrow (already reached my submission limit for today). I do realize now that I need to have a plan with my logistic ... [Read more...]

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In anticipation of next week’s Reproducible Science Hackathon at NESCent, I was thinking about Christie Bahlai’s post on “Baby steps for the open-curious.” Moving from Ye Olde Standard Computational Science Practice to a fully reproducible workflow seems a monumental task, but partially reproducible is better than not-at-all reproducible, ... [Read more...]

I have been working through (with some honest appreciation) a recent article comparing many classifiers on many data sets: “Do we Need Hundreds of Classifiers to Solve Real World Classification Problems?” Manuel Fernández-Delgado, Eva Cernadas, Senén Barro, Dinani Amorim; 15(Oct):3133−3181, 2014 (which we will call “the DWN paper” in ... [Read more...]

This post is motivated by a discussion that arose when I tested a strategy by Frank of Trading The Odds … Continue reading → [Read more...]

by Joseph Rickert November was an active and creative month for R user groups with over 50 events listed on the Revolution Analytics' Community Calendar. Here are some highlights that can be found by visiting the websites of a few of the groups that post and share presentations. James Thomson was ... [Read more...]

Yesterday, I published a post here on DataScience.LA with a simple/basic benchmark for dplyr. It... [Read more...]

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Review of the University of Washington Data Science CertificationInitial analysis of the Titanic Data Set from KaggleCriteo Labs Ad-Click data Kaggle Competition experienceOnline sources for datasetsWhat data tools stack I am using and whyHow to use Github [...] [Read more...]