September 2008

Welcome to FOSS Trading

September 28, 2008 | Joshua Ulrich

This blog will highlight the development and use of free open-source software to research, test, and trade financial markets.Meet the authors:Joshua Ulrich is currently the author and maintainer of four R packages:TTR - Technical Trading Rules - a suit...
[Read more...]

Group-level variances and correlations

September 23, 2008 | Yu-Sung Su

This is just a sum-up of what we should do when we try to estimate the group-level variances and correlations but the software failed to do so. As a R and lmer() user, I found this happens often.If this is the case, there are three potential problems... [Read more...]

Design Flaws in R #3 — Zero Subscripts

September 21, 2008 | Radford Neal

Unlike the two design flaws I posted about before (here, here, and also here), where one could at least see a reason for the design decision, even if it was unwise, this design flaw is just  incomprehensible.  For no reason at all that I can see, R allows one to ... [Read more...]

pmin and pmax

September 16, 2008 | R Tips

Did you know that there are multiple versions of the min and max function. make sure that you are using the right one. pmin and pmax are the 'parallel' versions of the min and max function, meaning that they can take vector arguments and return vectors back. Much better than ... [Read more...]

Highlights from useR!

September 11, 2008 | Leslie Hawthorn

By Pete Meyer, Ads Quality Statistics TeamGoogle was a sponsor of this year's international user conference in Dortmund, Germany for the R statistical programming environment. In addition to sessions focusing on statistical modeling in various areas of... [Read more...]

rgraph6 on R-Forge

September 4, 2008 | Michal

I have moved my rgraph6 R package to R-Forge. R-Forge is a website that facilitates development of R packages by providing services for version control (through Subversion), automatic checking and building of the packages including binaries for Windows and MacOS, as well as for collaboration with other R users/developers. ... [Read more...]

How do you measure a major league slugger?

September 1, 2008 | mike

I gave a talk last month at SAP Labs in Palo Alto, along with Jim Porzak of ResponSys, introducing the R Statistical Language to a Business Intelligence interest group.  The goal was to highlight how open source tools, like R, can be used to build predictive models.  The example I ... [Read more...]

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)