Posts Tagged ‘ statistics ’

Design Flaws in R #1 — Reversing Sequences

August 6, 2008
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Design Flaws in R #1 — Reversing Sequences

The R language for statistical computing has become the standard for academic statistical research, for the very good reason that it’s better than the alternatives. It’s far from perfect however. I could come up with a long “wish list” of desired features it lacks, but that’s not what I’ll do in this series of posts.

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How to Recover the Missing X(1) for the USL Scalability Model

July 29, 2008
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How to Recover the Missing X(1) for the USL Scalability Model

When it comes to assessing application scalability, controlled measurements of the type that can be obtained with tools like Grinder or LoadRunner, are very useful because they provide a direct measurement of the throughput, X(N), as a function of the...

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Guerrilla Data Analysis Class – Seats Still Available

July 14, 2008
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Guerrilla Data Analysis Class – Seats Still Available

Most operating systems are capable of collecting hundreds of system and performance metrics every second. Even if you only record them once an hour, after a week you will have more than 50,000 samples; after a month you will be staring at almost a quar...

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Get your R on

July 14, 2008
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Get your R on

useR! CONFERENCE, AUGUST 12-14 2008, DORTMUND GERMANYImpressive statistical computing types like Andrew Gelman, Gary King, and others will be presenting at this year’s useR! conference. Decision Science News might just have to hop over and check it out. The program looks great. Those interested in learning R might be interested in our Decision Science News

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An R Wiki

April 21, 2008
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An R Wiki

It’s been ages since I visited the R website, so I don’t know how long they’ve had a wiki. It’s built using DokuWiki, one of my personal favourites. This is a great leap forward for R documentation, which is somewhat notorious for being (a) difficult to find and (b) difficult to understand when you find

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Heuristics for statistics

January 28, 2008
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Heuristics for statistics

SIMPLE WAYS TO DETECT AND COMMUNICATE STATISTICAL EFFECTSDecision Science News is fond of heuristics and the Simonian view that for many problems organisms face, optimization is a fiction and satisficing makes us smart. Statistics is an area in which it is easy to see precision that isn’t there and find “optima” in problems that

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ERGMs in R

January 23, 2008
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ERGMs in R

Developers of statnet, a collection of packages for R for fitting Exponential Random Graph Models (ERGM), issued a major update. First change is that the main package is now called ergm. Secondly, a set of additional packages has been made available. Apart from package network, that provides a class system for relational data on which

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R video tutorial number 2

October 2, 2007
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R video tutorial number 2

READ TEXT FILES, RUN MODELSThe Decision Science News R video tutorials continue with number 2. (If you missed that last one, you will want to watch R Video Tutorial Number 1 first.) The Goldstein pedometer dataset can be downloaded from http://www.dangoldstein.com/flash/Rtutorial2/pedometer.csv Topics covered this week include:Tricking R into starting in your working directory Reading in text

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R video tutorial number 1

September 26, 2007
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R video tutorial number 1

LEARN R BY JUST WATCHINGFor this week, Decision Science News has created a video tutorial on how to get started using the R Language for Statistical Computing. (The tutorial is best viewed in your browser’s full-screen mode, try pressing F11 in Windows). R is free and open source, and constantly being improved upon by countless

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Things overheard at the useR! meeting

August 11, 2007
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Things overheard at the useR! meeting

Here are a few things I overheard at the useR! meeting. These comments and quotes do not necessarily represent my opinions (although many do) and since many of them were overheard in informal discussions and rants I will not name … Continue reading →

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