Monthly Archives: March 2010

Smoothing time series with R

March 29, 2010
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Smoothing time series with R

Smoothing is a statistical technique that helps you to spot trends in noisy data, and especially to compare trends between two or more fluctuating time series. It's a useful visualization tool that I'm pleased to see cropping up more and more in statistical graphics on the Web -- it's now a staple in econometric charts and is heavily used...

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Looking for Software Paths in Windows Registry

March 28, 2010
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Looking for Software Paths in Windows Registry

hen we want to call external programs in R under Windows, we often need to know the paths of these programs. For instance, we may want to know where ImageMagick is installed, as we need the convert (convert.exe) utility to convert images to other formats, or where OpenBUGS is installed because we need this path

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Example 7.29: Bubble plots colored by a fourth variable

March 27, 2010
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Example 7.29: Bubble plots colored by a fourth variable

In Example 7.28, we generated a bubble plot showing the relationship among CESD, age, and number of drinks, for women. An anonymous commenter asked whether it would be possible to color the circles according to gender. In the comments, we showed simp...

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Finance::YahooQuote 0.24

March 26, 2010
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Having espoused rule number one in regression testing in the post about yesterday's bug fix upload 0.23, we can now add rule number zero: Do not introduce a new error by omitting the trailing semicolon. I guess it shows that I don't really program in...

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Rcpp 0.7.11

March 26, 2010
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A new versions 0.7.11 of Rcpp is awaiting inclusion into CRAN and Debian. It is also available from here. This version fixes a somewhat serious bug uncovered by Doug Bates when working with vectors of strings. We also added a few new accessor func...

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‘R’ = dna.translate("AGG") . A custom C function for R, My notebook.

March 26, 2010
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In the following post, I will show how I've implemented a custom C function for R. This C function will translate a DNA to a protein. I'm very new to 'R' so feel free to make any comment about the code.C codeThe data in 'R' are stored in an opaque stru...

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Code Highlights in WordPress

March 26, 2010
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I’ve come across a very useful plugin for WordPress which highlights code in posts using GeSHi called WP-Syntax. This plugin is easy to use and adds highlights simply by putting the appropriate tags around code blocks. For instance, we can make the following R code much more readable by using WP-Syntax. ## Generate 100

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Predicting Pizza

March 26, 2010
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Predicting Pizza

What's the secret to the best pizza in New York? That's what statistical consultant and R user Jared Lander sought to find out, by analyzing the rankings of NY pizza joints at MenuPages.com, and building a regression model for ratings based on variables like localion, price, number of reviews, and pizza-oven type (gas, coal or wood)? Here's a scatterplot...

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Summarising data using dot plots

March 26, 2010
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Summarising data using dot plots

A dot plot is a type of display that compares counts, frequencies, totals or other summary measures for a series of categories. The dot plot can be arranged with the categories either on the vertical or horizontal axis of the display to allow comparising between the different categories as well as comparison within categories where

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BioMart (and biomaRt)

March 26, 2010
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BioMart (and biomaRt)

I’ve been vaguely aware of BioMart for a few years. Inexplicably, I’ve only recently started to use it. It’s one of the most useful applications I’ve ever used. The concept is simple. You have a set of identifiers that describe a biological object, such as a gene. These are called filters. They have values –

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