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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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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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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R Maps

September 6, 2010
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R Maps

This is an updated version of my Making Maps with R tutorial. I think the code is lot simpler and it also includes some data for you to play around with. Background: Spatial data are becoming increasingly common, as are the tools available in R to process it. Of course one of the best ways

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Less than negative?

September 6, 2010
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An interesting thing that I found while doing the analysis for my previous post on the Canterbury earthquakes, was the difficulty of constraining figures less than a negative number. For example:abcd> a 1 2 3 4 5 6 7 8 9 10> b 4 5 6> c TRUE...

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Less than negative?

September 6, 2010
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An interesting thing that I found while doing the analysis for my previous post on the Canterbury earthquakes, was the difficulty of constraining figures less than a negative number. For example:abcd> a 1 2 3 4 5 6 7 8 9 10> b 4 5 6> c TRUE...

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R Reshape Package

September 6, 2010
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R Reshape Package

Some of you may know this R reshape package already, I have started to play with it after the post Handling Large CSV Files in R. It is really an excellent one worthing a new post to introduce formally.What is reshape package? reshape: Flexibly reshape data, Reshape lets you flexibly restructure and aggregate data using just two...

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Canterbury Earthquake

September 6, 2010
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Canterbury Earthquake

4:35 am on Saturday morning, I was woken up by a 7.1 magnitude earthquake, the epicentre being approximately 30 km west of where I live in Christchurch, New Zealand. The earthquake was one of the largest that New Zealand has experienced, and has been the most destructive one since the earthquake that struck Napier in 1931. Thankfully, the...

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Canterbury Earthquake

September 6, 2010
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Canterbury Earthquake

4:35 am on Saturday morning, I was woken up by a 7.1 magnitude earthquake, the epicentre being approximately 30 km west of where I live in Christchurch, New Zealand. The earthquake was one of the largest that New Zealand has experienced, and has been the most destructive one since the earthquake that struck Napier in 1931. Thankfully, the...

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Coastal

September 6, 2010
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Coastal

UPDATE: cce asked for a chart of coastal locations broken out by their SST component and their Land componement. That’s a little tricky, but once you figure out the mask logic its just addition and such.There are TWO masks: One mask contains ALL zeros, except for coast cells which are fraction of LAND.The other mask

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In{s}a(ne)!!

September 5, 2010
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In{s}a(ne)!!

Having missed the earliest entry by Radford last month, due to disconnection in Yosemite, I was stunned to read his three entries of the past month about R performances being significantly modify when changing brackets with curly brackets! I (obviously!) checked on my own machine and found indeed the changes in system.time uncovered by Radford…

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MoshTemp 4.1

September 5, 2010
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MoshTemp 4.1

Replaces 4.0, minor changes made here and there. totally replaces 4.0 as the testing move forward. see 4.1 Run: DownloadAll. Run: DataSetUp. SSTTest reruns the SST analsyis and compares at HADSST2 Land1900Present: reruns the old version of program with a bench against CRU land figures. Next version will integrate more of raster to the analysis,

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Cricket World Cup 2011

September 5, 2010
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Cricket World Cup 2011

Cricket World Cup 2011: Fourteen countries will compete for Cricket championship in Cricket World Cup 2011 from Feb 19, 2011 to Apr 2, 2011 in the Indian sub-continent. India, Sri Lanka and Bangladesh will host 49 matches. Pakistan was removed from t...

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1936.

September 4, 2010
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1936.

UPDATE: Ron Broberg has a more definitive explanation of the difference which indicates that 5sig issue is not the main cause of the difference. See his exposition here CRU, it appears, trims out station data when it lies outside 5 sigma. Well, for certain years where there was actually record cold weather that leads to

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5 Sigma in CRU

September 4, 2010
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5 Sigma in CRU

UPDATE: Ron Broberg has a more definitive explanation of the difference which indicates that 5sig issue is not the main cause of the difference. See his exposition here A short update. I’m in the process of integration the Land Analysis and the SST analysis into one application. The principle task in front of me is integrating

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Thinking in R: vectors

September 4, 2010
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Thinking in R: vectors

While I have been using the R language/environment for over five years or so, whenever I needed to do some statistical calculations, until recently I was only a casual user. A few months ago I started to use R in more depth and made a conscious decision to try and do things the ‘R way’.

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The FourierDescriptors Package

September 4, 2010
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The FourierDescriptors Package

Introduction I’ve just uploaded a new package to CRAN based on a stimulus generation algorithm that I use for my experiments on vision. The FourierDescriptors package provides methods for creating, manipulating and visualizing Fourier descriptors, which are a representational scheme used to describe closed planar contours. The canonical reference from the literature is Zahn and

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Weekend art in R (Part 4)

September 4, 2010
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Weekend art in R (Part 4)

Computer creations are perfect by design. We put in numbers, and if all goes well we get out an exact result. If we want a line, we want it perfectly straight. If we want a circle, it should conform to the platonic ideal of a circle. From a mathematical standpoint, these perfect shapes and precisely

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Cricket data analysis

September 4, 2010
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Cricket data analysis

Cricket World Cup 2011 is approaching and I'm interested in analyzing one day international cricket data to predict some results and share interesting information about cricket.  For the analysis, I need cricket data and tried several things to ge...

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Creating a Presentation with LaTeX Beamer – Frame Transitions

September 4, 2010
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Creating a Presentation with LaTeX Beamer – Frame Transitions

Transitions are often used in presentations to break up the presentation and to keep the audience awake, but often the outcome is irritation/distraction with text or other objects flying on or off the screen from different directions. As such they should be used sparingly if at all in a talk. LaTeX beamer has a simple

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