1710 search results for "excel"

Intro to Parallel Random Number Generation with RevoScaleR

June 6, 2013
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Intro to Parallel Random Number Generation with RevoScaleR

by Joseph Rickert Random number generation is fundamental to doing computational statistics. As you might expect, R is very rich in random number resources. The R base code provides several high quality random number generators including: Wichmann-Hill, Marsaglia-Multicarry, Super-Duper, Mersenne-Twister, Knuth-TAOCP-2002 and L’Ecuyer-CMRG. (See Random for details.) And, there are at least three packages, rspring, rlecuyer, and rstream for...

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KDNuggets 2013 software poll results

June 5, 2013
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KDNuggets 2013 software poll results

The results of the 2013 KDNuggets software poll are in, with RapidMiner and R in a near-tie for first place. Of a record 1880 respondents, 737 reported using Rapid-I RapidMiner/RapidAnalytics, and 704 reported using R. Excel came in third: with 527 respondents, it was the lone commercial tool in the top 5. You can see the top 10 responses...

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Win Your Fantasy Football Auction Draft: Calculate the Optimal Players to Draft with this Shiny App in R

June 2, 2013
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In this post, I use a Shiny app in R to determine the best possible players to pick in a fantasy football auction draft.  The app takes projections from FantasyPros, a site that averages across numerous sources of projections.  Based on your ...

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Tweetanalytics – Interactively analyzing tweets from accounts of 5 universities

June 1, 2013
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Tweetanalytics – Interactively analyzing tweets from accounts of 5 universities

This is an attempt at learning and interactively displaying few results using twitter data using text mining. Interactivity is implemented using RStudio's shiny server. Their documentation of demo scripts came in very handy. As a non-user of twitter, I...

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Ryan Sheftel: "R on the Trading Desk"

May 30, 2013
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by Joseph Rickert In a post last week, I offered some first impressions about R/Finance 2013. Apparently, I was way off in estimating that 30% of the attendees were academics. The R/Finance organizers were quick to point out that percentage of academics attending the conference has been a constant 10% over the years; and this year was no different....

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(Another) introduction to R

May 27, 2013
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(Another) introduction to R

It’s Memorial Day and my dissertation defense is tomorrow. This week I’m phoning in my blog. I had the opportunity to teach a short course last week that was part of a larger workshop focused on ecosystem restoration. A fellow grad student and I taught a session on Excel and R for basic data analysis.

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Pairwise distances in R

May 26, 2013
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Pairwise distances in R

For a recent project I needed to calculate the pairwise distances of a set of observations to a set of cluster centers. In MATLAB you can use the pdist function for this. As far as I know, there is no equivalent in the R standard packages. So I looked into writing a fast implementation for

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xkcd Style Bubble Plot

May 23, 2013
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xkcd Style Bubble Plot

A package was recently released to generate plots in the style of xkcd using R. Being a big fan of the cartoon, I could not resist trying it out. So I set out to produce something like one of Hans Rosling’s bubble plots. First I needed some data. Spoilt for choice. I scraped some population data broken

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Pivot Tables for R: Try sqldf

May 21, 2013
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Pivot tables are a a growing staple for analysis in excel yet they remain limited to the functionality which Microsoft has chosen to include. Typical operations are the inclusion of filters, choice over rows, columns, and maths operations. In R … Continue reading →

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Using gdata, for MS Windows users

May 18, 2013
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Using gdata, for MS Windows users

I use both GNU-Linux and Windows systems on a regular basis… so I’m aware of the advantages (more for GNU-Linux in my case) and disadvantages of both. Recently I needed to analyse a database from a remote location, an Excel … Sigue leyendo →

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