I suppose the go to tool for fitting non-linear models in R is nls of the stats package. In this post I will show an alternative approach with Stan/RStan, as illustrated in the example, Dugongs: “nonlinear growth curve”, that is part of Stan’s documentation. The original example itself ... [Read more...]

I suppose the go to tool for fitting non-linear models in R is nls of the stats package. In this post I will show an alternative approach with Stan/RStan, as illustrated in the example, Dugongs: "nonlinear growth curve", that is part of Stan's documentation. The original example itself is ... [Read more...]

A new release of stringdist has been accepted on CRAN. stringdist offers a number of popular distance functions between sequences of integers or characters that are independent of character encoding. version 0.9.4 bugfix: edge case for zero-size for lower tridiagonal … Continue reading → [Read more...]

Introduction In this chapter we look at the use of the rplos package from rOpenSci to access the scientific literature from the Public Library of Science using the PLOS Search API. The Public Library of Science (PLOS) is the main champion of open access peer reviewed scientific publications and has ... [Read more...]

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This time next week we will be in full swing with Mango Solutions Boston EARL (Effective Applications of the R Language) Conference.  It is being held at the Microsoft NERD Exhibition Centre in Cambridge Massachusetts, Boston. DAY 1 – WOKSHOPS … Continue reading → [Read more...]

by Andrie de Vries Recently we had a question on the public mailing list for Revolution R Open (RRO), on the topic of "MKL multithreaded library and mclapply do not play well together". If you're not familiar with these topics, here is a quick primer: The Intel MKL is a ... [Read more...]

    By Chris Musselle In a previous article we went over why you might want to integrate both R and Python into a single pipeline, and how to do so via the use of a flat file air-gap. In … Continue reading → [Read more...]

Life has been busy and has kept me away from blogging, and from trading, mostly. Still, I can’t stay away from monitoring the markets, and, with the recent rally, I started asking myself – has the situation changed since the 200 day SMA signaled an exit. What do you think – make ... [Read more...]

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A new release rfoaas is now on CRAN following up on the recent upstream release 0.1.8 of FOAAS. The rfoaas package provides an interface for R to the most excellent FOAAS service--which provides a modern, scalable and RESTful web service for the frequent need to tell someone to f$#@ off. Release 0.1.8 ... [Read more...]

This post has been updated: 1. March 2018: Removed `bash ./tools/rsync-recommended` and  `bash ./tools/link-recommended`. They should not be needed anymore. 15. November 2017: Removed installing of recommended packages from build script. Those packages are now simply installed in the local library path which is also added to the `LIB_SITE`. This also ... [Read more...]

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Silver trade I’ve been reading Ronald Findlay and Kevin H. O’Rourke’s 2009 book Power and Plenty: Trade, War, and the World Economy in the Second Millennium and finding it an excellent piece of big picture economic history. I felt the urge to re-express one of their figures (Figure 4.7 ... [Read more...]

PNG images are essentially a grid of values that represent colors to display. Since each cell in the grid is made up of numbers, I got curious about what it might mean to aggregate multiple PNGs. What would it look like to average two or more images? Median? Mode? Random?... [Read more...]

PNG images are essentially a grid of values that represent colors to display. Since each cell in the grid is made up of numbers, I got curious about what it might mean to aggregate multiple PNGs. What would it look like to average two or more images? Median?To do ... [Read more...]

Over the years I have been amazed by how many friends of mine who seem otherwise very intelligent have gotten involved in Multilevel Marketing (MLM). And, as most people who have been involved with these organizations, all of my friends involved in these organization have ended up after many hours ... [Read more...]

Over the years I have been amazed by how many friends of mine who seem otherwise very intelligent have gotten involved in Multilevel Marketing (MLM).And, as most people who have been involved with these organizations, all of my friends involved in thes... [Read more...]

In this article, I will show you how to use the k-Nearest Neighbors algorithm (kNN for short) to predict whether price of Apple stock will increase or decrease. I obtained the data from Yahoo Finance. You can download the dataset here. What is the k-Nearest Neighbors algorithm? The kNN algorithm ... [Read more...]

SummaryThis personal project was inspired by my own experience in housing market. I was wondering what I can achieve with public data and Data Science methods. Built upon extensive research of domain knowledge, my model is very simple yet powerful. It used the data with most information, followed the trends ... [Read more...]