1413 search results for "regression"

What (Search Engines Think) People Want

July 17, 2010
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What (Search Engines Think) People Want

R O How G8 U R!Hey, R U there? Having used the R language for awhile now, I would like to let you know that R works - in fact R works really well. If you keep up with R news this should be no surprise...this is, after all...an r blog! R and R alone c...

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Wanted: Big-data beta testers

July 15, 2010
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We're nearing completion of the package of statistical tools for very large data sets that I gave an early preview of at R/Finance 2010. It will be released for Revolution R Enterprise later this year, but we're looking for some R users with big data sets to put the 1.0 version through its paces in the beta program and...

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Core in CiRM [2]

July 8, 2010
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Core in CiRM [2]

We are making slow progress on the normal and regression chapters as we decided to write the package at the same time we revise the chapters… Jean-Michel transformed the variable selection and model choice R codes of the regression chapter into generic functions that will fit within the package. I rewrote the section on testing,

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Core in CiRM [1]

July 6, 2010
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Core in CiRM [1]

Jean-Michel Marin and myself have thus started our “research in pair” in CIRM, Luminy, for a fortnight. We are working on the second edition of Bayesian Core and, despite working round the clock on the project (except for a one hour run around Mont Puget this morning), we are not going as fast as planned…

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Creating a Presentation with LaTeX Beamer – Basic Slides

July 5, 2010
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Creating a Presentation with LaTeX Beamer – Basic Slides

In a previous post we looked at using the LaTeX beamer package to create presentations. Given a title page and outline of a presentation the next stage will be to create the content that appears in various slides of the presentation. Fast Tube by Casper To create a slide we make use of the frame environment and

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Why Learn R? It’s the language of Statistics

June 24, 2010
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In the Introduction to his book “R for SAS and SPSS Users” (Springer 2009) Robert Muenchen offers ten reasons for learning R if you already know SAS or SPSS. All ten reasons say something important about R. However, his fourth reason: “R’s language is more powerful than SAS or SPSS. R developers write most of their analytic methods using...

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Linear Modeling in R and the Hubble Bubble

June 22, 2010
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Linear Modeling in R and the Hubble Bubble

Here is a scatter plot with the coordinate labels deliberately omitted. Figure 1. Do you see any trends? How would you model these data? It just so happens that this scatterplot is arguably the most famous scatterplot in history. One aficionado, writing more than forty years after its publication, commented skeptically :" data points were consequently spread...

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Linear Modeling in R and the Hubble Bubble

June 22, 2010
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Linear Modeling in R and the Hubble Bubble

Here is a scatter plot with the coordinate labels deliberately omitted. Figure 1. Do you see any trends? How would you model these data? It just so happens that this scatterplot is arguably the most famous scatterplot in history. One aficionado, writing more than forty years after its publication, commented skeptically :" data points were consequently spread...

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Example 7.42: Testing the proportionality assumption

June 21, 2010
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Example 7.42: Testing the proportionality assumption

In addition to the non-parametric tools discussed in recent entries, it's common to use proportional hazards regression, (section 4.3.1) also called Cox regression, in evaluating survival data.It's important in such models to test the proportionality a...

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Do Not Log-Transform Count Data, Bitches!

June 17, 2010
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Do Not Log-Transform Count Data, Bitches!

OK, so, the title of this article is actually Do not log-transform count data, but, as @ascidacea mentioned, you just can’t resist adding the “bitches” to the end. Onwards. If you’re like me, when you learned experimental stats, you were taught to worship at the throne of the Normal Distribution. Always check your data and

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