Monthly Archives: September 2010

Revolution R Enterprise 4.0 free download for academics

September 7, 2010
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The Windows version of our latest enterprise distribution of R, Revolution R Enterprise 4.0, is now being delivered to subscribers and is also available for free download for members of the academic community. Revolution R Enterprise 4.0 is a major update, and includes many new and improved features: Based on R 2.11.1, the current release of the R. See...

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Barchart or Dotchart?

September 7, 2010
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Barchart or Dotchart?

Which of the following two charts (both created with R) to you prefer? This dotchart: Or this bar chart? Andrew Gelman (who, incidentally, is speaking at the October NYC UseR meeting) prefers the dotchart prefers a line plot (update: see Gelman's comment, below), but personally I think the bar chart is more easily interpreted. What do you think? You...

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Example 8.4: Including subsetting conditions in output

September 7, 2010
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Example 8.4: Including subsetting conditions in output

A number of analyses perform operations on subsets. Making it clear what observations have been excluded or included is helpful to include in the output.SASThe where statement (section A.6.3) is a powerful and useful tool for subsetting on the fly. (...

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Embed R Code with Syntax Highlighting on your Blog

September 7, 2010
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If you use blogger or even wordpress you've probably found that it's complicated to post code snippets with spacing preserved and syntax highlighting (especially for R code). I've discovered a few workarounds that involve hacking the blogger HTML templ...

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Writing a Spatial Function: The Location Quotient

September 7, 2010
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Writing a Spatial Function: The Location Quotient

Background: In some cases it is necessary to conduct the same analysis multiple times on either the same or different data. In such circumstances it is worth writing a function to simplify the code. In this example the location quotient provides a simple calculation easily written in to a function. The location quotient (LQ) is

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Canterbury Earthquakes part II

September 7, 2010
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Canterbury Earthquakes part II

Since posting last night, there's been several more aftershocks, including several big ones. The total now stands (at 7:00pm) at 304 aftershocks, 70 greater than 4 on the Richter scale, 29 greater than 4.5, and 10 greater than 5. A couple of the fives ...

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Confidence Bands for Universal Scalability Models

September 7, 2010
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Confidence Bands for Universal Scalability Models

In the recent GDAT class, confidence intervals (CI) for performance data were discussed. Their generalization to confidence bands (CB) for scalability projections using the USL model also came up informally. I showed a prototype plot but it was an ugly hack. Later requests from GDAT attendees to apply CBs to their own data meant I had...

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CCE

September 7, 2010
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CCE

Wasnt that hard. green is land, blue is sea. new data awaits you. old data taken down For Zeke: Green is landcoast cells, blue is seacoast.  The cells are AREA weighted per cce request but not Fractiionally weighted. That is if a cell is 90% land and 10% water, this weighting is NOT applied. I

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Truly random?!

September 6, 2010
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Truly random?!

Having purchased the September edition of La Recherche because of its (disappointing!) coverage on black matter, I came by a short coverage on an Intel circuit producing “truly random” numbers… I already discussed this issue in an earlier post, namely that there is no reason physical generators are “more” random than congruential pseudo-random generators, but

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Gdb Macros for R

September 6, 2010
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When debugging R interactively, one hurdle to navigate is unwrapping SEXP objects to get at the inner data. Gdb has some useful macro functionality that allows you to wrap useful command sequences in reusable chunks. I recently put together the followi...

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