1415 search results for "Regression"

Parallel processing in R for Windows

March 4, 2011
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The doSMP package (and its companion package, revoIPC), previously bundled only with Revolution R, is now available on CRAN for use with open-source R under the GPL2 license. In short, doSMP makes it easy to do SMP parallel processing on a Windows box with multiple processors. (It works on Mac and Linux too, but it's been relatively easy to...

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Anova – Type I/II/III SS explained

March 2, 2011
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Anova – Type I/II/III SS explained

Not my post, just bookmarking this. It’s from http://goanna.cs.rmit.edu.au/~fscholer/anova.php ANOVA (and R) The ANOVA Controversy ANOVA is a statistical process for analysing the amount of variance that is contributed to a sample by different factors. It was initially derived by R. A. Fisher in 1925, for the case of balanced data (equal numbers of observations

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How Does R Deal with Categorical Explanatory Variables?

March 1, 2011
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How Does R Deal with Categorical Explanatory Variables?

Here's a video tutorial where I demonstrate an answer to this question.This video is designed to instill a baseline level of practical knowledge. There is more to how R treats factors in regression models. An interested reader should Google "R contra...

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Data from last post

March 1, 2011
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Data from last post

Posting the code I used in the last post wasn't that useful unless I also posted the data set. Here's the data. These are made up data, but it is a nice data set for illustrating how to conduct a regression. Enjoy!

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Book review: 25 Recipes for Getting Started with R

February 24, 2011
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Book review: 25 Recipes for Getting Started with R

Recently I was asked by O’Reilly publishing to give a book review for Paul Teetor new introductory book to R.  After giving the book some attention and appreciating it’s delivery of the material, I was happy to write and post this review.  Also, I’m very happy to see how a major publishing house like O’Reilly is producing more and

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September 2011 Arctic Sea Ice Extent Forecast

February 22, 2011
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September 2011 Arctic Sea Ice Extent Forecast

In this post, I use a quadratic regression model to forecast the  September, 2011  Arctic Sea Ice Extent. The model was developed with  1980 – 2010 data. Links to the R script, source data and  how-to article on polynomial regression … Continue reading →

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Using R for Introductory Statistics, Chapter 5, hypergeometric distribution

February 21, 2011
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Using R for Introductory Statistics, Chapter 5, hypergeometric distribution

This is a little digression from Chapter 5 of Using R for Introductory Statistics that led me to the hypergeometric distribution.Question 5.13 A sample of 100 people is drawn from a population of 600,000. If it is known that 40% of the population h...

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Using R for Introductory Statistics, Chapter 5, hypergeometric distribution

February 21, 2011
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Using R for Introductory Statistics, Chapter 5, hypergeometric distribution

This is a little digression from Chapter 5 of Using R for Introductory Statistics that led me to the hypergeometric distribution.Question 5.13 A sample of 100 people is drawn from a population of 600,000. If it is known that 40% of the population has a specific attribute, what is the probability that 35 or...

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Some R Package Updates

February 18, 2011
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Packages for R are being added and updated so frequently now that it's tough to keep up with them all (the @CRANberriesFeed Twitter feed helps, though). But here are a couple of recent package updates that caught my eye: The Rcpp package for seamless integration between R and C++ has been updated. While most of the changes are under...

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Silver and Russell 2000

February 16, 2011
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Silver and Russell 2000

When I find a chart that looks like this, I always like to explore a little further. via StockCharts.com I pull it into R and try to find anything worthwhile.  I do not find anything, except that I do not want to be trading both in the same direc...

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