Blog Archives

The Collatz Conjecture Continued

September 9, 2014
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by Seth Mottaghinejad Let's review the Collatz conjecture, which says that given a positive integer n, the following recursive algorithm will always terminate: if n is 1, stop, otherwise recurse on the following if n is even, then divide it by 2 if n is odd, then multiply it by 3 and add 1 In our last post, we...

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Long Memory and the Nile: Herodotus, Hurst and H

September 4, 2014
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Long Memory and the Nile: Herodotus, Hurst and H

by Joseph Rickert The ancient Egyptians were a people with long memories. The lists of their pharaohs went back thousands of years, and we still have the names and tax assessments for certain persons and institutions from the time of Ramesses II. When Herodotus began writing about Egypt and the Nile (~ 450 BC), the Egyptians who knew that...

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Using R to simulate the finances of public sector pension funds

September 2, 2014
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by Don Boyd, Senior Fellow, Rockefeller Institute of Government The Rockefeller Institute of Government is excited to be developing models to simulate the finances of public pension funds, using R. Public pension funds invest contributions from governments and public sector workers in an effort to ensure that they can pay all promised benefits when due. State and local government...

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R User Group Roundup

August 28, 2014
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R User Group Roundup

by Joseph Rickert In the first half of 2014, worldwide R user group activity continued to increase, showing impressive growth over the same periods for the past couple of years. For the last four months, the pace has been over 50 meetings per month. n There are now 147 user groups listed in Revolution Analytics' Local R User Group...

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Statistics: Losing Ground to CS, Losing Image Among Students

August 26, 2014
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by Norman Matloff The American Statistical Association (ASA) leadership, and many in Statistics academia. have been undergoing a period of angst the last few years, They worry that the field of Statistics is headed for a future of reduced national influence and importance, with the feeling that: The field is to a large extent being usurped by other disciplines,...

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Revolution Analytics’ User Group Map Contest has a Winner

August 21, 2014
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by Joseph Rickert We are pleased to announce that Jo-fai Chow is the winner of the Revolution Analytics contest. Jo-fai’s entry, which was implemented as a Shiny project, may be viewed by clicking on the figure below. Jo-fai’s work not only produced an aesthetically pleasing sequence of maps but also provides a superb example of a well-documented, small project...

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Integrating R with production systems using an HTTP API

August 19, 2014
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Integrating R with production systems using an HTTP API

by Nick Elprin, Co-Founder of Domino Data Lab We built a platform that lets analysts deploy R code to an HTTP server with one click, and we describe it in detail below. If you have ever wanted to invoke your R model with a simple HTTP call, without dealing with any infrastructure setup or asking for help from developers...

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Model building with the iris data set for Big Data

August 14, 2014
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Model building with the iris data set for Big Data

by Joseph Rickert I think we can be sure that when American botanist Edgar Anderson meticulously collected data on three species of iris in the early 1930s he had no idea that these data would produce a computational storm that would persist well into the 21st century. The calculations started, presumably by hand, when R. A. Fisher selected this...

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Quantitative Finance applications in R – 8

August 12, 2014
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Quantitative Finance applications in R – 8

The latest in a series by Daniel Hanson Introduction Correlations between holdings in a portfolio are of course a key component in financial risk management. Borrowing a tool common in fields such as bioinformatics and genetics, we will look at how to use heat maps in R for visualizing correlations among financial returns, and examine behavior in both a...

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Incidental R

August 7, 2014
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Incidental R

by Joseph Rickert Last week, I posted a list of sessions at the Joint Statistical Meetings related to R. As it turned out, that list was only the tip of the iceberg. In some areas of statistics, such as graphics, simulation and computational statistics the use of R is so prevalent that people working in the field often don't...

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