1697 search results for "excel"

Character strings in R

February 19, 2014
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Character strings in R

This post deals with the basics of character strings in R. My main reference has been Gaston Sanchez‘s ebook , which is excellent and you should read it if interested in manipulating text in R. I got the encoding’s section from , which is also a nice reference to have nearby. Text analysis will be

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R and (Software) Relatives

February 18, 2014
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R and (Software) Relatives

Post also available with code executed inline at rpubs.com. O'Reilly recently published the results of a survey from attendees of the Strata Conference related to tool usage and salary.  The entire survey is available for download.  In the survey results, R was heralded as second only to SQL as a tool used by conference attendees.  An chart from the...

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Development of a R code to solve a large system of equations with linear constrains

February 18, 2014
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Our project team is aimed at providing data analysis to the rest of the company to make data-driven decisions. We faced a problem when we discovered that the Excel solver was not able to solve some “large” problem. So we switched to R and our first tests are quite encouraging. Now we need some support The post

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Probabilistic Momentum

February 16, 2014
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Probabilistic Momentum

David Varadi has recently discussed an interesting strategy in the Are Simple Momentum Strategies Too Dumb? Introducing Probabilistic Momentum post. David also provided the Probabilistic Momentum Spreadsheet if you are interested in doing computations in Excel. Today I want to show how you can test such strategy using the Systematic Investor Toolbox: The Simple Momentum

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Reproducible research, training wheels, and knitr

February 15, 2014
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Reproducible research, training wheels, and knitr

Last week I gave a short talk at CMU’s statistical computing seminar, Stat Bytes. I summarized why reproducible research (RR) and literate programming are worthwhile, not just for serious research but also for homework reports or statistical blog posts. I … Continue reading →

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Revolution R Enterprise in the Amazon Cloud

February 12, 2014
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by Oliver Vagner, Cloud Solutions Lead Architect at Revolution Analytics Today, I am pleased to announce our new offering in the Amazon Web Services Big Data Marketplace – Revolution R Enterprise 7 for AWS. Of course, if you follow this blog, then you are quite familiar with Revolution R Enterprise (RRE) and what it brings to the table with...

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Live Google Spreadsheet For Keeping Track Of Sochi Medals

February 11, 2014
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The “medals” R post by TRInker and re-blogged by Revolutions were both spiffy and a live example why there’s no point in not publishing raw data. You don’t need to have R (or any other language) do the scraping, though. The “IMPORTHTML” function (yes, function names seem to be ALL CAPS now over at Google

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There is no Such Thing as Biomedical "Big Data"

February 11, 2014
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There is no Such Thing as Biomedical "Big Data"

At the moment, the world is obsessed with “Big Data” yet it sometimes seems that people who use this phrase don’t have a good grasp of its meaning.  Like most good buzz-words, “Big Data” sparks the idea of something grand and complicated, while sounding ordinary enough that listeners feel like they have an intuitive understanding of the concept.  However...

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Scraping Pro-Football Data and Interactive Charts using rCharts, ggplot2, and shiny

February 10, 2014
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This post uses pro-football (American) boxscore data from 1966 through 2013 and generates few interactive charts using rCharts, ggplot2 and shiny.  It also provided a first time exposure to the power of dplyr. Data for these charts were scraped fr...

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After 1st semester of Statistics PhD program

February 9, 2014
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After 1st semester of Statistics PhD program

Have you ever wondered whether the first semester of a PhD is really all that busy? My complete lack of posts last fall should prove it Some thoughts on the Fall term, now that Spring is well under way: The … Continue reading →

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