Posts Tagged ‘ statistics ’

The Second Coming

June 18, 2009
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Pew Research has found that 79% of Americans believe in The Second Coming of Jesus. What worries me more is not that 4 out of 5 Americans believe in The Second Coming, but that 1 out of 5 believes it will happen in their lifetime. It seems inevitable that such a belief will grossly warp

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NYT: In Simulation Work, the Demand Is Real

June 16, 2009
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The New York Times published this interesting article on how the ability to design and perform computer simulations is a highly marketable skill for careers across many disciplines.In methodology development we use simulation nearly every day. We've developed our own specialized genetic data simulation software, genomeSIMLA, that's freely available here by request for PC, Mac, and Linux.But if...

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Side by side analyses in Stata, SPSS, SAS, and R

June 15, 2009
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I've linked to UCLA's stat computing resources once before on a previous post about choosing the right analysis for the questions your asking and the data types you have. Here's another section of the same website that has code to run an identical analysis in all of these statistical packages, with examples to walk through (as they note...

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Introductory statistics with R

June 5, 2009
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I know that a lot of you are scrambling to spend your training grant money by next week. If you think you'll ever need to use R, I strongly recommend buying this book: Introductory Statistics with R, by Peter Dalgaard ($48, Amazon). I picked this up a while back and read through most of it in a...

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R and data

May 26, 2009
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R and data

My fellow bloggers John and Scott have posted recently about the free statistical programming language R.  How does it compare to an expensive language like SAS? If you’ve done any statistical analysis, then you’ll know that getting and cleaning the data is a major step in any project.  SAS does a pretty good job at

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Negative Scalability Coefficients in Excel

May 12, 2009
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Negative Scalability Coefficients in Excel

Recently, several performance engineers, who have been applying my universal scalability law (USL) to their throughput measurements, reported a problem whereby their Excel spreadsheet calculations produced a negative value for the coherency parameter (...

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R Reference Card (PDF)

May 5, 2009
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Last week I posted a short tutorial on how to merge datasets using R. R is a free and open-source statistical computing software and programming language (get R here). The only downside is a steeper learning curve because the documentation is sparse and often difficult to understand at first. Once you start using it, you'll realize...

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Marriage and Happiness

April 7, 2009
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The Pew Research Center just published a piece reviewing their finding that people who are married report significantly greater levels of happiness than those who are unmarried. I always enjoy this result, particularly because of contemporary Western c...

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Inference for R

March 24, 2009
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Inference for R

CREATE AUTOMATICALLY UPDATED R CHARTS AND TABLES INSIDE WORD & EXCEL Decision Science News’ imagination has been recently captured by an innovative product called Inference for R. (R as in the open-source language for statistical computation.) To use it, you simply insert some code into your Microsoft Office documents. The Inference product connects to the

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American Immigration Trends

March 22, 2009
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The New York Times has a beautiful visualization of immigration trends in the United States since 1880. I highly recommend spending a few minutes playing with the interactive display.

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