1849 search results for "time series"

Fast-track publishing using knitr: exporting images for sharing and press (part III)

January 7, 2014
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Fast-track publishing using knitr: exporting images for sharing and press (part III)

(This article was first published on G-Forge » R, and kindly contributed to R-bloggers) Images can be a powerful medium if used right. The image is CC by alemdag. Fast-track publishing using knitr is a short series on how I use knitr to speedup publishing in my research. This is the third article in the series devoted to plots....

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analyze the national immunization survey (nis) with r

January 6, 2014
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for twenty years now, the centers for disease control and prevention (cdc) has been random-digit-dialing american households to ask parents which vaccinations their little tykes have received.  and since vaccination history might not be at the for...

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Cran2deb4ubuntu: An Update for 2014

January 5, 2014
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I have been a little quiet on the update front for the past few months, so I thought I would give a quick update as 2014 begins. Between increased responsibilities at work (pseudo-department chair) and some family health issues, work on cran2deb4ubunt...

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Fast-track publishing using knitr: intro (part I)

December 30, 2013
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Fast-track publishing using knitr: intro (part I)

Fast-track publishing using knitr is a short series on how I use knitr to get my articles faster published. By fast-track publishing I mean eliminating as many of the obstacles as possible during the manuscript phase, and not the fast-track some journals offer. In this first introductory article I will try to (1) define the main groups of...

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The performance gains from switching R’s linear algebra libraries

The performance gains from switching R’s linear algebra libraries

What is often forgotten in the so-called data analysis "language wars” is that, across most of these languages, many common computations are performed using outsourced dynamically linked math libraries. For example, R; Python's Numpy; Julia; Matlab; and Mathematica all make heavy use of the BLAS linear algebra API. As a result, R can't be properly »more

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How fair is White Elephant?

December 24, 2013
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How fair is White Elephant?

This article was first published on analyze stuff. It has been contributed to Anything but R-bitrary in celebration of its introductory post.By Max Ghenis Welcome to analyze stuff! For our first post, I wanted to reflect on the time of year; after all, ‘tis the season for hams and yams, caroling and sledding, and of...

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How fair is White Elephant?

December 24, 2013
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How fair is White Elephant?

Welcome to analyze stuff! For our first post, I wanted to reflect on the time of year; after all, ‘tis the season for hams and yams, caroling and sledding, and of course gifts! One popular party gift exchange game is the White Elephant, where each person brings a wrapped (typically regifted or otherwise odd-ball)...

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Welcoming our Guest Bloggers

December 20, 2013
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I'm heading out on vacation shortly but don't worry: we have a fantastic series of guest bloggers contributing to the Revolution blog for the next 3 weeks. We'll have posts from the Revolution Analytics development team, contributions from prominent R community members, and industry experts. And I'll still pop in from time to time with a few pre-scheduled surprises....

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Twelve Days 2013: LASSO Regression

December 19, 2013
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Day Eight: LASSO Regression TL/DR LASSO regression (least absolute shrinkage and selection operator) is a modified form of least squares regression that penalizes model complexity via a regularization parameter. It does so by including a term proportional to $||\beta||_{l_1}$ in the objective function which shrinks coefficients towards zero, and can even eliminate them entirely. In that light, LASSO is a...

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Converting graphs in pdf files to csv format

December 19, 2013
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Converting graphs in pdf files to csv format

Looking at a graph displayed as part of a pdf document is so tantalizing; I want that data as a csv! One way to get the data is to email the author(s) and ask for it. I do this regularly and sometimes get the apologetic reply that the data is confidential. But I can see

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