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The GenEstim function presented here uses a very simple genetic algorithm to estimate parameters. The function returns the best estimated set of parameters ($estim), the AIC ($information) at each generation, and the cost of the best model ($bestcost) at each generation. Results of running the program with a logistic function : ... [Read more...]

Another trio concert at CSO, but very different from the most recent classic piano trio. Tonight was once again a chance to see Dianne Reeves (wikipedia) but this time accompanied simply by two guitarists: Russell Malone and Romero Lubambo (wikipedia). Given that Dianne Reeves (who we had seen in just ... [Read more...]

After introducing a colleague to the wonders of Dropbox today (more on that later) I realized that it might be useful to put out a list of software that is of use to graduate students. I often find that many of the software products I find indispensable are virtually unknown ... [Read more...]

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A quick workaround to have a filled.contour plot with natural log10-log10 scale (instead of the default natural log scale) plotmat [Read more...]

October 2009 Open Data Group has launched a changed detection project on Google Code, http://code.google.com/p/change-detection/. This is an introduction and demonstration of using open source software and the Data Mining Group’s Predictive Model Markup Language (PMML) standard to perform data analytics.  Specifically, we show how ... [Read more...]

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Welcome to part two of the Introduction to The R Project for Statistical Computing tutorial. If you missed part one, it can be found here. In this segment, we will explore the following topics.Importing DataVariablesWorkspace FilesConsole FilesFinding ... [Read more...]

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topsyWidgetPreload({ "url": "http%3A%2F%2Fborasky-research.net%2F2009%2F10%2F14%2Fwhats-happening-man%2F", "style": "big", "title": "What's Happening, Man?" }); There is quite a bit of activity on the AlgoCompSynth front. As you may know, I’m a SUSE Studio subscriber, and I’m building openSUSE 11.1-based appliances there. One of ... [Read more...]

A new version of RPostgreSQL just went out to CRAN and should propagate via the mirrors over the next few days. This is a maintenance and bug fix release that addresses four of the seven issue at the Google Code page. Two more are really enhancemen... [Read more...]

The relationship between two variables can be visually represented using a scatter plot and will provide some insight into the correlation between the variables and possible models to describe the relationship. There are different ways to produce scatter plots in R making use of either the base graphics system, the ... [Read more...]

I am not a fan of MS Windows software. However, the reality is that majority of people use it and it is often easier for me to live with this than to convert the sorounding souls. Additionally I am find ing out lately that majority of my favourite open... [Read more...]

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If you use Emacs and ESS to run R, then here’s a nice tweak I found on the Emacs Wiki. The following bit of elisp goes in your .emacs file (or equivalent). Starting with an R file in the buffer, hitting shift-enter vertically splits the window and starts R ... [Read more...]

Christian: of course you will be running the Chicago 2010 marathon as your next fall marathon. Not only are Paris and Chicago jumelée (i.e. sister cities), but the Dollar is so conveniently falling vis-à-vis the Euro that you'd get all this done for about a Euro and a ... [Read more...]

hc_appattach(hc_app) hc_fit.o1hc_fit.f1hc_fit.o2hc_fit.f2plot(as.Date(Dates),Oppose,main="Public opinion and health care reform",ylim=c(0,80),pch=16,xlim=c(as.Date("2009-01-01"),as.Date("2009-11-01")),cex.axis=.85, col="#E6ADD8",xlab="",ylab="Percentage approving ... [Read more...]

R is a free, cross-platform, open-source statistical analysis language and program. It is also an alternative to expensive commercial statistics software such as SPSS. The environment for R differs from the typical point and click interface found in mo... [Read more...]

Earlier today the 33rd Chicago Marathon was held. I will organise my comments by pointing out three epic fails. First, of course, was the Chicago weather. After two successive marathon in excessive heat --- the 2007 race I completed, poorly, with its thousands of runners forced to abandon when the race ... [Read more...]