Publications by Isomorphismes
"With the the increasing availability of complicated alternative investment strategies to both retail…"
“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 important as ever. There won’t be one right answer delivered in these metrics and charts...
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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 probabilities, such as the chance of extraterrestrial intelligence in the Drake Equation, and sit...
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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 distributions are not symmetric. Most distributions do not have mean = median = mode. Most dist...
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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 going on. > plot(faithful, pch=19, col=rgb(.1,.1,.1,.5), cex=.6) Firstly: what is par? When you t...
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An unabashedly narcissistic data analysis of my own tweets. The…
pie( table( whence.i.tweet )) qplot( whence ) + coord_polar() pie( log( table( whence )))+RColorBrewer ggplot (see below) plot( density( tweets.len )) qplot(… stat=”density”) + geom_density qplot(…stat=”bin”) + geom_text(…) tweeple tweeple + facet_wrap(~category) An unabashedly narcissistic data analysis of my own tweets. T...
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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) [,1] [,2] [,3] [1,] 1 0 0 [2,] 0 1 0 [3,] 0 0 1 That’s it. > diag(11) [,1] [,2] [,3...
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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 Jeff Goldblum’s hand taking a very different path down depending on random parameters? Or—as...
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Outer Product of Character Vectors in R
What follows is like a kata to strengthen your R fundamentals. The lovely stats in the wild recently posted some hott data analysis of Olympians’ ages and sexes. Because I’m annoyingly picky about graphics, I asked for his code so I could tweak the graphics according to my own perfidious norms. Stats in the wild posted his scraper of sports-...
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Why trust some supposed laws of statistical sampling and…
Why trust some supposed laws of statistical sampling and convergence when you can just test them yourself? If you have a computer with R installed (also recommended: Rstudio) then you can stop dithering about whether these n=1000 studies cited in the newspapers actually resemble the truth enough, or not. # make some people # let's say 1e5 one-dim...
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Economic geography of the eastern USA circa 1999, median incomes…
Economic geography of the eastern USA circa 1999, median incomes by zip code Code and data source to follow in a longer post. Related To leave a comment for the author, please follow the link and comment on their blog: Isomorphismes. R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many other topics. ...
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