1409 search results for "regression"

Updating to R 2.15, warnings in R and an updated function list for Serious Stats

May 27, 2012
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Updating to R 2.15, warnings in R and an updated function list for Serious Stats

Whilst writing the book  the latest version of R changed several times. Although I started on an earlier version, the bulk of the book was written with 2.11 and it was finished under R 2.12. The final version of the R scripts were therefore run and checked using R 2.12 and, in the main, the most recent

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Temperature reconstruction with useless proxies

May 25, 2012
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Temperature reconstruction with useless proxies

In a number of previous posts I considered the temperature proxies that have been used to reconstruct global mean temperatures during the past millenium. In this post I want to show how such a temperature reconstruction would look like if the proxies had no relation at all to the actual temperatures. The motivation is the

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The grade level of Congress speeches, analyzed with R

May 22, 2012
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The grade level of Congress speeches, analyzed with R

As widely reported by CNN, the Huffington Post, Talking Points Memo, the sophistication of speeches by US politicians has declined in recent years, dropping from an 11th-grade level in 2005 to a 10th-grade level today. The reports are based on an analysis by the Sunlight Foundation, based on textual analysis of congressional speeches given since 1996 provided by the...

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A complete Bayesian model for sensory profiling data

May 22, 2012
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A complete Bayesian model for sensory profiling data

In this post I will try to add an important parts in the sensory profiling model I have been building. This concerns the question: 'Are all panelists equally reproducible?'. Obviously the answer is no, some are better than others. From this observation...

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Classical Technical Patterns

May 21, 2012
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Classical Technical Patterns

In my presentation about Seasonality Analysis and Pattern Matching at the R/Finance conference, I used examples that I have previously covered in my blog: Month of the Year Seasonality – I introduced the Seasonality charts in the Historical Seasonality Analysis: What company in DOW 30 is likely to do well in January? post. I also

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Permutation tests in R

May 21, 2012
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Permutation tests in R

Permuation tests (also called randomization or re-randomization tests) have been around for a long time, but it took the advent of high-speed computers to make them practically available. They can be particularly useful when your data are sampled from unkown … Continue reading →

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Time-Series Policy Evaluation in R

May 21, 2012
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Time-Series Policy Evaluation in R

Quantifying the success of government policies is clearly important. Randomized control trials, like those conducted by drug companies, are often described as the ‘gold-standard’ for policy evaluation. Under these, a policy is implemented in/to one area/group (treatment), but not in/to another (control). The difference in outcomes between the two areas or groups represents the effectiveness

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Criticism 4 of NHST: No Mechanism for Producing Substantive Cumulative Knowledge

May 18, 2012
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In this fourth part of my series of criticisms of NHST, I’m going to focus on broad

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Example Reproducible Report using R Markdown: Analysis of California Schools Test Data

May 18, 2012
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Example Reproducible Report using R Markdown:  Analysis of California Schools Test Data

This is a quick set of analyses of the California Test Score dataset. The post was produced using R Markdown in RStudio 0.96. The main purpose of this post is to provide a case study of using R Markdown to prepare a quick reproducible report. It provides examples of using plots, output, in-line R code, and...

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Stepping Outside My Open-Source Comfort Zone: A First Look at Golden Helix SVS

May 16, 2012
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Stepping Outside My Open-Source Comfort Zone: A First Look at Golden Helix SVS

I'm a huge supporter of the Free and Open Source Software movement. I've written more about R than anything else on this blog, all the code I post here is free and open-source, and a while back I invited you to steal this blog under a cc-by-sa license....

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