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    On both Windows and Mac I have been happy to use RStudio for R development and the GitHub app for handling version control. The app seems to be GitHub's own preferred interface, and if you use it you don't even need Git for Windows. I'm not sure why you wouldn't just do that. The only […]

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  • 10/17/14--08:07: Amending a hasty commit
  • On my current project I occasionally have to report anomalies in input data to people upstream, who can look into them. I do this with html files which I knit from R Markdown. They have to include prose, code, results, and pictures. As I edit them on my way to the final product, it's practical […]

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    Here's how I did it: On a new Mac running Mavericks and R 3.1.2 with devtools, I installed Java for Mac. I installed the RJDBC package from CRAN (which depends on the DBI package also from CRAN) and the teradataR package from GitHub. I downloaded the Teradata JDBC driver, unpacked it, and moved tdgssconfig.jar and […]

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  • 01/30/15--10:21: Regularization and the Bible
  • There are two kinds of regression regularization: ridge, or L2, and Lasso, or L1. They both let you get rid of some variance (less is good) in return for picking up some bias (of which also less is good; that's the trade-off). How they go about it makes sense if you compare two versions of […]

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    This is how I did it. Your mileage may vary. Prerequisites: - XCode with command line tools - MacPorts - cmake, autoconf, automake, libtool, libusb*, rtl-sdr All programs listed on the last item above came from MacPorts**, with sudo port install PROGRAM with the exception of libusb. The first four on the list are required […]

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    Suppose you have an unbalanced panel with daily data observed at the zip code level, with some zip codes (labeled zip.cd) not having any records on some days (labeled cal.dt). Suppose also that these zip codes are clustered in DMA's (labeled dma.cd). Suppose now that you want it balanced so all zip code + date […]

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    On my FreeNAS home server I added a new jail, called it awsboss. I also added a new ZFS dataset, called it storage. I added this data set to awsboss as /mnt/storage and I also made it into an AFP share so it could be mounted by my Mac clients. The storage database will receive […]

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  • 02/21/15--13:29: More about FreeNAS jails
  • My first attempt to upload a large tarball to Glacier was a success, as described here, but subsequent ones failed. The reason, I suspect, is that the FreeNAS server is headless. I get shell access to its jails in a browser tab from one of the Mac clients. If I launch a slow upload and […]

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