Monthly Archives: December 2016

Companies using R

December 28, 2016
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Companies using R

R is a free programming language for data analysis, statistical modeling and visualization. It is one of the most popular tool in predictive modeling world. Its popularity is getting better day by day. In 2016 data science salary survey conducted by O'Reilly, R was ranked second in a category of programming languages for data science (SQL ranked first). In...

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R code to accompany Real-World Machine Learning (Chapters 2-4 Updates)

December 28, 2016
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R code to accompany Real-World Machine Learning (Chapters 2-4 Updates)

Abstract I updated the R code to accompany Chapter 2-4 of the book “Real-World Machine Learning” by Henrik Brink, Joseph W. Richards, and Mark Fetherolf to be more consistent with the listings and figures as presented in the book. rwml-R Chapters...

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Behind the scenes of CRAN

December 27, 2016
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(Just from my point of view as a package maintainer.)New users of R might not appreciate the full benefit of CRAN and new package maintainers may not appreciate the importance of keeping their packages updated and free of warnings and errors. This is something I only came to realize myself in the last few years

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More on Orthogonal Regression

December 27, 2016
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Some time ago I wrote a post about orthogonal regression. This is where we fit a regression line so that we minimize the sum of the squares of the orthogonal (rather than vertical) distances from the data points to the regression line.Subsequently, I received the following email comment:"Thanks for this blog post. I enjoyed reading it. I'm wondering how straightforward...

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R For Beginners: Some Simple R Code to do Common Statistical Procedures, Part Two

December 27, 2016
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R For Beginners:  Some Simple R Code to do Common Statistical Procedures, Part Two

An R tutorial by D. M. Wiig This posting contains an embedded Word document. To view the document full screen click on the icon in the lower right hand corner of the embedded document.    

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Analyzing the 2015 California Health Interview Survey in R

December 27, 2016
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Analyzing the 2015 California Health Interview Survey in R

A few years ago, I wrote about how to analyze the 2012 California Health Interview Survey in R. In 2012, plans for Covered California (Obamacare in California) were just beginning to take shape. Today, Covered California is a relatively mature program and it is arguably the most successful implementation of the Affordable Care Act in the United States. This...

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List Vol.2 Exercises

December 27, 2016
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List Vol.2 Exercises

Answers to the exercises are available here. Exercise 1 Consider 3 vectors, day, month and year: year=c(2005:2016) month=c(1:12) day=c(1:31) Define a list Date such as: Date= $year 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 $month 1 2 3 4 5 6 7 8 9 10 11 12 $day

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Parallelizing Data Analytics on Azure with the R Interface Tool

December 27, 2016
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Parallelizing Data Analytics on Azure with the R Interface Tool

by Le Zhang (Data Scientist, Microsoft) and Graham Williams (Director of Data Science, Microsoft) In data science, to develop a model with optimal performance, exploratory experiments on different sets of hyper-parameters are often performed. Preliminary analyses on smaller data can be performed on a single machine, while the experimental one on large-scale data by sweeping multi-sets of parameters can...

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add layer to specific panel of facet_plot output

December 27, 2016
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add layer to specific panel of facet_plot output

This is a question from ggtree google group: Dear ggtree team, how can I apply a geom_xxx to only one facet panel? For example if i want to get geom_hline(yintersect=1:30) or a geom_text() in the dot panel? I cant see the facet_grid(. ~ var) function call, so I don’t know which subsetting to use. I have already read http://stackoverflow.com/questions/29873155/geom-text-and-facets-not-working tr

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An Overview of Room Rentals in Sydney | RSelenium, rvest, Leaflet, googleway

December 27, 2016
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An Overview of Room Rentals in Sydney | RSelenium, rvest, Leaflet, googleway

Started another data scraping script similar to the post about rental rates in Houston; except this time i picked Sydney, Australia. The site that i’ve selected uses an awful lot of javascript, so the rvest package won’t be enough in … Continue reading →

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