Monthly Archives: August 2013

Classifieur Naïf Bayésien

August 5, 2013
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IntroductionLe classifieur naïf bayésien est l'une des méthodes les plus simples en apprentissage supervisé basée sur le théorème de Bayes. il est peu utilisé par les praticiens du data mining au détriment des méthodes traditionnelles que sont les arbres de décision ou les régressions logistiques.Un avantage de cette méthode est la simplicité de programmation, la facilité d'estimation des paramètres...

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Calendar-based Sector Strategy

August 5, 2013
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Calendar-based Sector Strategy

I recently came across the Kaeppel’s Sector Seasonality Strategy which is described in Kaeppel’s Corner: Sector Seasonality and updated in Kaeppel’s Corner: Get Me Back, Clarence. Today I want to show how to back-test the Kaeppel’s Sector Seasonality Strategy using the Systematic Investor Toolbox. Following are the strategy rules: Buy Fidelity Select Technology (FSPTX) at

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How Much Should Bale Cost Real?

August 5, 2013
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How Much Should Bale Cost Real?

It looks increasingly likely that Gareth Bale will transfer from Tottenham to Real Madrid for a world record transfer fee. Negotiations are ongoing, with both parties keen to get the best deal possible deal with the transfer fee. Reports speculate that this transfer fee will be anywhere in the very wide range of £80m to

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Drawing a 95% confidence interval in R

August 5, 2013
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Drawing a 95% confidence interval in R

I’m writing a post on how to draw a in 95% confidence interval in R by hand. I spent an hour or so trying to figure this out, and most message threads point someone to the ellipse() function. However, I wanted … Continue reading →

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Creating as and wrap for sparse matrices

August 5, 2013
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Creating as and wrap for sparse matrices

An earlier article discussed sparse matrix conversion but stopped short of showing how to create custom as<>() and wrap() methods or functions. This post starts to close this gap. We will again look at sparse matrices from the Matrix package for R, as well as the SpMat class from Armadillo.At least for now we will limit outselves...

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Heatmapping Washington, DC Rental Price Changes using OpenStreetMaps

August 4, 2013
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Heatmapping Washington, DC Rental Price Changes using OpenStreetMaps

Percentage change of median price per square foot from July 2012 to July 2013: Percentage change of median price from July 2012 to July 2013: Last November I made a  choropleth of median rental prices in the San Francisco Bay Area using data from my company, Kwelia.  I have wanted to figure out how to

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Changepoint Analysis of Time Series?

August 4, 2013
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Changepoint Analysis of Time Series?

Last time we downloaded data from quandl.com.  This was privately-owned homes completed in a month in thousands of units(not seasonally adjusted).  Now, let's take a look at some basic R functions to examine time series along with my first ex...

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RcppArmadillo 0.3.900.7

August 4, 2013
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A bug-fix release 3.900.7 of Armadillo was provided by Conrad a few days ago. It has been rolled into a new RcppArmadillo release 0.3.900.7 which, after a brief delay, is now on CRAN and in Debian. The main bug fix is a change in the in-place vers...

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More rainfall calculations – REML

August 4, 2013
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More rainfall calculations – REML

I wanted to have a look at various REML methods for a long time. The rainfall data seemed a nice example. On top of that, FreshBiostats had a blog post 'Mixed Models in R: lme4, nlme, or both?'. So lme4 it is.The data  As described before; th...

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A new R trick … for me at least

August 3, 2013
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What were going to be talking about today are dynamic argument lists for functions. Specifically, how to unpack and prepare them in R using ..., list(), and do.call()Biased by Matlab and varargin Initially, I based my use of ... in R on my experience w...

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