Monthly Archives: March 2012

Modeling Trick: the Signed Pseudo Logarithm

March 1, 2012
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Modeling Trick: the Signed Pseudo Logarithm

Much of the data that the analyst uses exhibits extraordinary range. For example: incomes, company sizes, popularity of books and any “winner takes all process”; (see: Living in A Lognormal World). Tukey recommended the logarithm as an important “stabilizing transform” (a transform that brings data into a more usable form prior to generating exploratory statistics, Related posts:

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Download and Parse NAREIT Data

March 1, 2012
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Download and Parse NAREIT Data

This is the first post of a series that describes how to download and parse specific data sets into R. These kinds of scripts can be functionalized further, but I doubt that these will ever find their way into a formal package. They are intended to be helpful to those facing similar tasks, but as

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NIT: Fatty acids study in R – Part 001

March 1, 2012
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NIT: Fatty acids study in R – Part 001

This time I´m going to use my own data to develop a model to predict some fatty acid in the solid fat (pork).Samples had been analyzed in a NIT (Near Infrared Transmittance) instrument. The range of the wavelengths is from 850 to 1048 nm (100 data poi...

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Poisson approximation of binomial probabilities

March 1, 2012
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Poisson approximation of binomial probabilities

This is yet another experiment to see how good is the approximation of binomial probability when we use Poisson and normal distributions for scenarios with large $n$, and $p$ close to zero or one. Consider a problem where the random variable $X$ follows a binomial distribution with a known probability of success $p$, and number of trials $n$. If $n$...

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R code for Chapter 1 of Non-Life Insurance Pricing with GLM

March 1, 2012
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R code for Chapter 1 of Non-Life Insurance Pricing with GLM

Insurance pricing is backwards and primitive, harking back to an era before computers. One standard (and good) textbook on the topic is Non-Life Insurance Pricing with Generalized Linear Models by Esbjorn Ohlsson and Born Johansson. We have been doing some work in this area recently. Needing a robust internal training course...

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Parallelizing Voting simulation

March 1, 2012
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Parallelizing Voting simulation

Last week I have compared synchronous and asynchronous implementation of NetLogo Voting model. An interesting afterthought is that synchronous model implementation can be easily made much faster using vectorization.The two versions of the Voting synchr...

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I see high frequency data

March 1, 2012
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I see high frequency data

In the previous post I shared an example how to get high frequency data from IB broker (well, it is retail version of HFD – it has only best bid/ask and the trades). Now, once you saved some data – what should you do next? Next logical step would be data sanity check and visualization.

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Bad Science at Strata 2012

March 1, 2012
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Ben Goldacre, the physician and biostatistician behind the always-excellent Bad Science column in the Guardian, gave a barnburner of a talk at Strata 2012 yesterday, "The Information Architecture of Medicine is Broken". For anyone not aware of the problems caused by publication bias in clinical trials (for example, ineffective drugs with a wide variety of side-effects coming to market),...

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First Milano R net meeting

March 1, 2012
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First Milano R net meeting

May 8, 2012 - 18:00 - 21:00 Fiori Oscuri Bistrot & Bar Via Fiori Oscuri, 3 - Milano (Zona Brera) Continue reading →

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Example 9.22: shading plots and inequalities

March 1, 2012
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Example 9.22: shading plots and inequalities

A colleague teaching college algebra wrote in the R-sig-teaching list asking for assistance in plotting the solutions to the inequality x^2 - 3 > 0. This type of display is handy in providing a graphical solution to accompany an analytic one. RThe plot...

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