1629 search results for "excel"

Global Migration Flow Table Estimates

October 23, 2013
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Global Migration Flow Table Estimates

A few months Demographic Research published my paper on estimating global migration flow tables. In the paper I developed a method to estimate international migrant flows, for which there is limited comparable data, to matches changes in migrant stock data, … Continue reading →

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Review: Kölner R Meeting 18 October 2013

October 22, 2013
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Review: Kölner R Meeting 18 October 2013

The Cologne R user group met last Friday for two talks on split apply combine in R and XLConnect by Bernd Weiß and Günter Faes respectively, before the usual Schnitzel and Kölsch at the Lux.Split apply combine in R The apply family of functions in R is incredible powerful, yet for newcomers often somewhat mysterious....

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machine learning [book review, part 2]

October 21, 2013
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machine learning [book review, part 2]

The chapter (Chap. 3) on Bayesian updating or learning (a most appropriate term) for discrete data is well-done in Machine Learning, a probabilistic perspective if a bit stretched (which is easy with 1000 pages left!). I like the remark (Section 3.5.3) about the log-sum-exp trick. While lengthy, the chapter (Chap. 4) on Gaussian models has

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How Do You Write Your Model Definitions?

October 20, 2013
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How Do You Write Your Model Definitions?

I’m often irritated by that when a statistical method is explained, such as linear regression, it is often characterized by how it can be calculated rather than by what model is assumed and fitted. A typical example of this is that linear regression is often described as a method that uses ordinary least squares to calculate the best...

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boxplotdbl and diaplt Packages 1.0.0 Public Beta are Available

October 20, 2013
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boxplotdbl and diaplt Packages 1.0.0 Public Beta are Available

These are beta version because the help manuals are not written yet.  Their functions are already matured to the releasse stage.  I will put them to CRAN as soon as … Continue reading →

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Markdown or LaTeX?

October 19, 2013
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Markdown or LaTeX?

What happens if you ask for too much power from Markdown? R Markdown is one of the document formats that knitr supports, and it is probably the most popular one. I have been asked many times about the choice between Markdown and LaTeX, so I think I'...

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Big and small daycares in Toronto by building type, mapped using RGoogleMaps and Toronto Open Data

October 17, 2013
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Big and small daycares in Toronto by building type, mapped using RGoogleMaps and Toronto Open Data

Before my daughter was born, I thought that my wife and I would have to send her to a licensed child care centre somewhere in Toronto.  I had heard over and over how long of a waiting list I should … Continue reading →

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Introduction to Feature selection for bioinformaticians using R, correlation matrix filters, PCA & backward selection

October 17, 2013
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Introduction to Feature selection for bioinformaticians using R, correlation matrix filters, PCA & backward selection

Bioinformatics is becoming more and more a Data Mining field. Every passing day, Genomics and Proteomics yield bucketloads of multivariate data (genes, proteins, DNA, identified peptides, structures), and every one of these biological data units are described by a number of features: length, physicochemical properties, scores, etc. Careful consideration of which features to select when trying...

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A first step towards R from spreadsheets

October 16, 2013
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A first step towards R from spreadsheets

Move your data analysis to a computing environment specifically designed for it. Why R and not spreadsheets? Here are three reasons: complexity graphics money Spreadsheets are easily overwhelmed.  Very complex things can be done in spreadsheets — it is just that complex spreadsheets are inefficient and dangerous. Graphics should be considered vital when doing anything with The post A...

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Creating Colorblind-Friendly Figures

October 16, 2013
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Creating Colorblind-Friendly Figures

Color is often used to display an extra dimension in plots of scientific data. Unfortunately, everyone does not decode color in exactly the same way. This is especially true for those with color vision deficiency, which affects up to 8 percent of the population in its 2 most common forms. As …

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