Is the Tax Code the longest Title?

  Last week, I shared that Dan Katz and I had finally published a draft of our paper, Measuring the Complexity of the Law: The U.S. Code.  We'd previewed this research on Computational Legal Studies years ago.  Since then, we've received great feedback and a number of questions.   The most common question, even among legal professionals,

By |2013-08-19T08:52:29-04:00August 19th, 2013|Law, Programming, Technology|0 Comments

Plotting average read and write operation size by ASM disk for Oracle

  Throughput, throughput, throughput - for many databases, this is the performance measure of importance.  When you are working with a fixed number of IOPS but see mixed workload types, system health can be assessed through the average read and write operation size.  In an ASM environment, we can query this information by ASM disk

By |2013-06-12T10:01:22-04:00June 12th, 2013|Consulting, Programming|0 Comments

Plotting Oracle RMAN backup durations with R

  How long does your Oracle RMAN backup take to complete?  How does this vary over time?  Are there patterns by week, week of month, or day of week?   The gist below can help you evaluate questions like these.  If you're interested in using R with Oracle more generally, check out this previous post

By |2013-06-03T20:44:00-04:00June 3rd, 2013|Consulting|0 Comments

Revisiting text processing with R and Python

  Back in 2011, I covered the relative performance difference of the most popular libraries for text processing in R and Python.   In case you can't guess the answer, Python and NLTK  won by a significant margin over R and tm.  Text processing with R seemed simple on paper, but performance and flexibility limitations have

By |2013-05-25T21:19:25-04:00May 25th, 2013|Consulting, Programming|0 Comments

Connecting R to an Oracle database with RJDBC

In many circumstances, you might want to connect R directly to a database to store and retrieve data.  If the source database is an Oracle database, you have a number of options: ROracle RODBC RJDBC   Using ROracle should theoretically provide you with the best performing client, as this library is a wrapper around the

By |2012-11-22T11:00:36-05:00November 22nd, 2012|Consulting, Programming|8 Comments

Retrieving the VIX term structure in R

  Much of my time lately has gone into analyzing and trading products in the volatility complex.  As a result, I regularly watch the VIX term structure for continuations or deviations from trend.  To make analysis simpler, I've written some R code that rips the term structure off the CBOE VIX term structure page and

By |2012-11-05T07:22:44-05:00November 5th, 2012|Consulting, Programming|1 Comment

Debugging parameter mismatch across RAC database instances with R, dba_hist, and gv$parameter

Did you find this post useful?  Does your organization need Oracle services?  We can help.   Much of this morning went into investigating strange ADDM reports on a two-node Oracle RAC database.  For some reason, there were statistically improbable differences between impact percentages that have persisted over a month; in this case, instance 2 would

By |2012-10-09T11:48:26-04:00October 9th, 2012|Consulting, Programming, Technology|0 Comments

Summary of community detection algorithms in igraph 0.6

  Based on Launchpad traffic and mailing list responses, Gabor and Tamas will soon be releasing igraph 0.6.  In celebration, I’ll be publishing a number of helpful lists and tables I’ve put together to organize information about igraph.   In this post, we’ll cover the community detection algorithms (~i.e., clustering, partitioning, segmenting) available in 0.6

By |2012-06-17T09:26:51-04:00June 17th, 2012|Consulting, Programming|0 Comments

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