Blog Archives

Bare-bones intro to Plotting options in R

March 21, 2012
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Bare-bones intro to Plotting options in R

If you’re using base::plot in R for the first time (for example if you do plot(pima) or plot(faithful) (use ??pima if you can’t find the dataset)) you may have looked at ?plot (2 page help file) or ?par (12 page help file) to figure out what’s go...

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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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lembarrasduchoix asked: thank you for the introduction to…

March 6, 2012
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lembarrasduchoix asked:
thank you for the introduction to…

lembarrasduchoix asked: thank you for the introduction to Newcomb’s paradox! Could you do a post on your favorite paradoxes?    The decision theory paradoxes I’m familiar with are: Ellsberg Paradox— Theorists encode bothsituations with unknown...

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"With the the increasing availability of complicated alternative investment strategies to both retail…"

December 10, 2011
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“With the the increasing availability of complicated alternative investment strategies to both retail and institutional investors, and the broad availability of financial data, an engaging debate about performance analysis and evaluation is as import...

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Earthquakes

November 30, 2011
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Earthquakes

> data(quakes)> head(quakes) lat long depth mag stations 1 -20.42 181.62 562 4.8 41 2 -20.62 181.03 650 4.2 15 3 -26.00 184.10 42 5.4 43 4 -17.97 181.66 626...

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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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Once you’re comfortable with 2-arrays and 2-matrices, you…

October 15, 2011
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Once you’re comfortable with 2-arrays and 2-matrices, you…

Once you’re comfortable with 2-arrays and 2-matrices, you can move up a dimension or two, to 4-arrays or 4-tensors. You can move up to a 3-array / 3-tensor just by imagining a matrix which “extends back into the blackboard”. Like a 5 × 5 ma...

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Hey! I made you some Wiener processes!

September 7, 2011
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Hey! I made you some Wiener processes!

Check them out. Here are thirty homoskedastic ones: > homo.wiener for (j in 1:30) {  for (i in 2:length(homo.wiener)) {          homo.wiener for (j in 1:30) {        plot( homo.wiener,           type = "l", col = rgb(.1,....

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Seriously … why don’t math classes use computers?…

August 31, 2011
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Seriously … why don’t math classes use computers? Excel, simple Python scripts, Mathematica / Sage, everything beyond the TI-83. Kids could be creating totally sweet visuals instead of cribbing formulae. And thinking instead of copying. I can sa...

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"My interpretation of [Leland Wilkinson’s] grammar [of statistical graphics]: —Data is the most…"

August 25, 2011
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"My interpretation of [Leland Wilkinson’s] grammar [of statistical graphics]: —Data is the most…"

“My interpretation of grammar : —Data is the most important thing, and the thing that you bring to the table. —Geometric objects … what you actually see on the plot: points, lines, polygons, etc. ...

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