1722 search results for "time series"

Using Rcpp to access the C API of xts

January 19, 2013
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Using Rcpp to access the C API of xts

The xts package by Jeff Ryan and Josh Ulrich is an immensely powerful tool that is widely used for timeseries work with R. Recently, the question about how to use it from Rcpp came up on StackOverflow and in a thread on the rcpp-devel list. In fact, xts has had an exposed API since 2008, but it...

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Using Rcpp to access the C API of xts

January 19, 2013
By
Using Rcpp to access the C API of xts

The xts package by Jeff Ryan and Josh Ulrich is an immensely powerful tool that is widely used for timeseries work with R. Recently, the question about how to use it from Rcpp came up on StackOverflow and in a thread on the rcpp-devel list. In fact, xts has had an exposed API since 2008, but it...

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In case you missed it: December 2012 Roundup

January 17, 2013
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In case you missed them, here are some articles from December of particular interest to R users. The blog is.R ran an excellent series of R tips and applications in December, with posts including working with Stata files, working with graphs and networks, and text analysis. Kohske Takahashi provides R scripts to create a collection of optical illusions. Highlights...

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Optimal number of clusters

January 16, 2013
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Optimal number of clusters

In the last post, Examples of Current Major Market Clusters, we looked at clustering Major Markets into 4 groups based on their correlations in 2012. Today, I want to continue with clustering theme and discuss methods of selecting number of clusters. I will look at the following methods of selecting optimal number of clusters: Minimum

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Review of R Graphics Cookbook by Winston Chang

January 16, 2013
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I just got a copy of Winston Chang's book R Graphics Cookbook, published by O'Reilly Media. This book follows now a series of O'Reilly books on R, including an R Cookbook. Winston Chang is a graduate student at Northwestern University but … Continue reading →

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Warning: Sawtooth’s MaxDiff Is Nothing More Than a Technique for Rank Ordering Features!

January 14, 2013
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Sawtooth Software has created a good deal of confusion with its latest sales video published on YouTube.  I was contacted last week by one of my clients who had seen the video and wanted to know why I was not using such a powerful technique for me...

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Using TeXmacs as an interface for R

January 14, 2013
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Using TeXmacs as an interface for R

Using TeXmacs as an interface for R (part 1)(This post was copied from my post at wordpress. Because I didn't manage to switch r-bloggers.com to use that blog, I'm reposting it here....) A nice, but not very well known, interface to R isTeXmacs. (I...

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analyze the health and retirement study (hrs) with r

January 14, 2013
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the hrs is the one and only longitudinal survey of american seniors.  with a panel starting its third decade, the current pool of respondents includes older folks who have been interviewed every two years as far back as 1992.  unlike cross-se...

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A first example of using Boost

January 14, 2013
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A first example of using Boost

Boost is, to quote the quote by Sutter and Alexandrescu which adornes the Boost website, …one of the most highly regarded and expertly designed C++ library projects in the world. The impact of Boost on C++ cannot be overstated. Boost is, at its core, a collection of thoroughly designed and peer-reviewed libraries. Some of these have...

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audiolyzR: Data sonification with R

January 13, 2013
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audiolyzR: Data sonification with R

In his talk “Give Your Data A Listen” at last summer’s useR! 2012 conference, Eric Stone presented joint work with Jesse Garrison on audiolyzR, an R package for “data sonification.” I thought this was a nifty and well-executed idea. Since I haven’t seen … Continue reading →

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