For my Q2 2012 commentary, I tried multiple graphs to illustrate the disconnect of the US stock markets with the rest of the world. I think I finally settled on this simple Excel bar graph populated by Bloomberg data, but I thought some might lik...
Monthly Archives: July 2012
Project Euler — problem 11
It’s been a while since I solved one Euler problem last time. Has been busy. Now I’m back and continue to solve the next problem, which is to find the maximum. Let’s take a look at the 11th problem: What … Continue reading →
Citing R or SAS
One of us recently read a colleague's first draft of a paper, in which she had written: "All analyses were done in R 2.14.0." We assume we're preaching to the converted here, when we say that the enormous amount of work that goes into R needs to be re...
My first competition at Kaggle
For me Kaggle becomes a social network for data scientist, as stackoverflow.com or github.com for programmers. If you are data scientist, machine learner or statistician you better off to have a profile there, otherwise you do not exist. Nevertheless, I won’t bet on rosy future for data scientist as journalists suggest (sexy job for next
Popularity of R continues
No doubt those that read my blog know that the tools I use to do my Industrial Engineering and Operations Research work heavily rely on the open source side of software. That is why I try to support as many open source projects such as COIN-OR, G...
Moving beyond hopeless graphics
I was at a talk awhile ago where the speaker presented tables with 4, 5, 6, even 8 significant digits even though, as is usual, only the first or second digit of each number conveyed any useful information. A graph would be better, but even if you’re too lazy to make a plot, a bit
Random portfolios versus Monte Carlo
What is the difference between Monte Carlo — as it is usually defined in finance — and random portfolios? The meaning of “Monte Carlo” The idea of “Monte Carlo” is very simple. It is a fancy word for “simulation”. As usual, it is all too possible to find incredibly muddied explanations of such a simple … Continue reading...
Simple distribution plot in R
Plot the distribution of a sample as bars and add a histogram line for visualizing the sample characteristics.
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MatLab, SAS, STATA, SPSS, Excel users: Try R, damn it!
Due to my work with a multitude of statistical packages in my career I may be able to evaluate a lot of them. I’ve first used Excel for my calculations as most of the normal users do. I like the idea behind a spreadsheet and the combination of data and click-to-do functions. Nevertheless I’ve often
Olive vs. Sunflower oil Spectra – 002 (ChemoSpec)
I add other data set of “sunflower oil” to import together with the olive oil into ChemoSpec R package. Before, as I showed in a video (Preparing spectra to import into ChemoSpec), every sample has been acquired with a NIR instrument (in transmitta...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
