872 search results for "parallel"

Version 1.0 of multilevelPSA Available on CRAN

February 14, 2013
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Version 1.0 of multilevelPSA Available on CRAN

Version 1.0 of multilevelPSA has been released to CRAN. The multilevelPSA package provides functions to estimate and visualize propensity score models with multilevel, or clustered, data. The graphics are an extension of PSAgraphics package by Helmreich and Pruzek. The example below will investigate the differences between private and public school internationally using the Programme of International Student Assessment...

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Oracle R Enterprise 1.3 gives predictive analytics an in-database performance boost

February 6, 2013
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Oracle R Enterprise 1.3 gives predictive analytics an in-database performance boost

Recently released Oracle R Enterprise 1.3 adds packages to R that enable even more in-database analytics. These packages provide horizontal, commonly used techniques that are blazingly fast in-database for large data. With Oracle R Enterprise 1.3, Oracle makes R even better and usable in enterprise settings. (You can download ORE 1.3 here and documentation here.) ...

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MCMSki IV, Jan. 6-8 (9?), 2014, Chamonix (news #3)

February 5, 2013
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MCMSki IV, Jan. 6-8 (9?), 2014, Chamonix (news #3)

In case you have not been constantly tracking the changes on the MCMSki IV webpage, here are some news: the number of invited and accepted contributed sessions in the program had considerably increased, to the point of almost filling two parallel sessions for the whole duration of the meeting. This includes an exciting round-table on

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Hilary: the most poisoned baby name in US history

January 29, 2013
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Hilary: the most poisoned baby name in US history

I’ve always had a special fondness for my name, which — according to Ryan Gosling in “Lars and the Real Girl” — is a scientific fact for most people (Ryan Gosling constitutes scientific proof in my book). Plus, the root … Continue reading →

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Disruptive Data Science – Transforming Your Company into a Data Science-Driven Enterprise

January 29, 2013
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Disruptive Data Science – Transforming Your Company into a Data Science-Driven Enterprise

Big Data is the latest technology wave impacting C-Level executives across all areas of business, but amid the hype, there remains confusion about what it all means. The name emphasizes the exponential growth of data volumes worldwide (collectively, 5 Exabytes/ day in the latest estimate I saw from IDC), but more nuanced definitions of Big Data incorporate the following...

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Tensor Algebra: Efficient Operations on Multidimensional Arrays with R

January 25, 2013
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 Multidimensional arrays are ubiquitous. Any complex problem having multivariate observables would easily generate a need to represent corresponding data in multidimensional arrays. Most of the practitioners would choose to apply operations on the...

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Writing Better Statistical Programs in R

January 24, 2013
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Writing Better Statistical Programs in R

A while back a friend asked me for advice about speeding up some R code that they’d written. Because they were running an extensive Monte Carlo simulation of a model they’d been developing, the poor performance of their code had become an impediment to their work. After I looked through their code, it was clear

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Oracle R Distribution Performance Benchmark

January 18, 2013
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Oracle R Distribution Performance Benchmark

Oracle R Distribution Performance Benchmarks Oracle R Distribution provides dramatic performance gains with MKL Using the recognized R benchmark R-benchmark-25.R test script, we compared the performance of Oracle R Distribution with and with...

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If SPSS can factor analyze MaxDiff scores, why can’t R?

January 17, 2013
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If SPSS can factor analyze MaxDiff scores, why can’t R?

Answer:  The variance-covariance matrix containing all the MaxDiff scores is not invertible.  R tells you that, either with an error message or a warning.  SPSS, at least earlier versions still in use, runs the factor analysis witho...

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Steve Culman on the `plyr` Package

January 17, 2013
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At Davis R Users’ Group yesteray, Steve Culman gave us an introduction to the plyr package and how to use it to manipulate data. Here’s his presentation, and the accompanying demonstration script: Steve’s talk is based on this paper by Hadley Wickham in the Journal of Statistical Software. A lot of useful related...

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