Posts Tagged ‘ maths ’

multiplicitiesoffreedom demonstrates Chaos Theory in Excel. If…

June 29, 2012
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multiplicitiesoffreedom demonstrates Chaos Theory in Excel. If…

multiplicitiesoffreedom demonstrates Chaos Theory in Excel. If he filled in more initial values, you would see a thick bar—like a picture of white-noise. Butterflies flapping their wings in Vermont to change the wind in Hangzhou? A drop of water on ...

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How do I Create the Identity Matrix in R?

June 27, 2012
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How do I Create the Identity Matrix in R?

I googled for this once upon a time and nothing came up. Hopefully this saves someone ten minutes of digging about in the documentation. You make identity matrices with the keyword diag, and the number of dimensions in parentheses. > diag(3) [,...

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How Not To Draw a Probability Distribution

March 7, 2012
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How Not To Draw a Probability Distribution

If I google for “probability distribution” I find the following extremely bad picture: It’s bad because it conflates ideas and oversimplifies how variable probability distributions can generally be. Most distributions are not unimodal. Most dist...

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Error Handling in Lyx & Sweave: using Quantmod (and R, of course)

November 8, 2011
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I do reports for clients with LyX and Sweave. It took me an extremely long time to get them working, but now that they’re working I can do more in an hour and thus charge more per hour. If you’re not familiar, here’s a rundown: LaTeX is the stand...

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B*tchin’ six dimensional 6-cube. The rainbow colours and…

July 1, 2011
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B*tchin’ six dimensional 6-cube. The rainbow colours and…

B*tchin’ six dimensional 6-cube. The rainbow colours and glass panes really help this visualisation.  Examples of 6-dimensional things If it’s hard to envision 6 dimensions, consider this: the possible tunings of a guitar constitute a 6-dimensio...

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Easiest way to start imagining four-dimensional things is by…

January 15, 2011
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Easiest way to start imagining four-dimensional things is by…

Easiest way to start imagining four-dimensional things is by numbering the corners of a 4-cube. First realize that the eight corners of a cube can be numbered “in binary” 000—001–010–100—110–101–011—111. Just like the four corners of ...

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cumsum ( rnorm(50), lend="butt", lwd=12, type="h" ) Cumulative…

December 8, 2010
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cumsum ( rnorm(50), lend="butt", lwd=12, type="h" )
Cumulative…

cumsum ( rnorm(50), lend="butt", lwd=12, type="h" ) Cumulative sum of 50 draws from a normal distribution. File this under mysteries of the Central Limit Theorem.

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Central Limit Theorem A nice illustration of the Central Limit…

October 20, 2010
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Central Limit Theorem
A nice illustration of the Central Limit…

Central Limit Theorem A nice illustration of the Central Limit Theorem by convolution.in R: Heaviside 0,1,0) }HH

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Here is how to improve your charts, graphs, maps, and…

October 2, 2010
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Here is how to improve your charts, graphs, maps, and…

Here is how to improve your charts, graphs, maps, and plots: Erase non-data ink. Erase redundant data ink. Maximize the ratio of data to ink. Show data variation, not design variation. The surface area of graphical elements should be directly proportio...

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extrapolation and interpolation The most important lesson I…

May 25, 2010
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extrapolation and interpolation
The most important lesson I…

extrapolation and interpolation The most important lesson I learned from this book:  regression is reliable for interpolation, but not for extrapolation.  Even further, your observations really need to cover the whole gamut of causal variables, inter...

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