Monthly Archives: December 2011

Programming traps when using "sample"

December 23, 2011
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Programming traps when using "sample"

Standard sample function works differently when it gets single element integer vector as opposed to longer vectors. This can lead to unexpected bugs in R code.Several times I had a problem with code similar to one given here:for (i in 1:4) {&...

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Norman Nie on two big problems with Big Data

December 23, 2011
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Revolution Analytics CEO Norman Nie sat down with Cassimir Medford from Business Agility to talk about the problems business today face with respect to Big Data. The two big problems identified: finding adequately trained personnel and locating the right tools. Norman traces the problem of finding skilled practitioners to work with Big Data to the US educational system: The...

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Portfolio Optimization in R, Part 4

December 23, 2011
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Portfolio Optimization in R, Part 4

This post will conclude the portfolio optimization series.  In this post, we will construct a trading strategy based on portfolio optimization and test the results against the CAPM market portfolio as well as another strategy.It is worth reiterati...

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googleVis 0.2.13: new stepped area chart and improved geo charts

December 23, 2011
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googleVis 0.2.13: new stepped area chart and improved geo charts

On 7th December Google published a new version of their Visualisation API. The new version adds a new chart type: Stepped Area Chart and provides improvements to Geo Chart. Now Geo Chart has similar functionality to Geo Map, but while Geo Map requires ...

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Happy Holidays and Best Wishes for 2012

December 22, 2011
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Happy Holidays and Best Wishes for 2012

This is just a quick note to wish you and your family a very healthy and happy holidays and wonderful New Year! I hope you enjoyed reading my blog and thank you for your comments and emails. Here is a short R code that implements an interesting idea from the Charting the Santa Claus Rally

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AQP 0.9-9 is ready: 1.0 should be out by 2012-01-01 !

December 22, 2011
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AQP 0.9-9 is ready: 1.0 should be out by 2012-01-01 !

Version 1.0 of AQP is nearly ready-- after nearly 3 years of development, 2 years on R-Forge, and 1+ year on CRAN. Just pushed version 0.9-9 to R-Forge, and it should be on CRAN within a couple days. Recent changes are listed below, clipped from the NE...

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R 2.14.1 is released

December 22, 2011
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Peter Dalgaard announced today the release of the new R version 2.14.1.  Bellow is the announcement.  For R users who are using windows, I suggest to also have a look at one of the following two posts, suggestion an alternative strategy for how to more easily upgrade R under Windows XP, or under windows 7 (which tends to have more permission...

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Dynamic views don’t support javascript-so reverting back to simple views

December 22, 2011
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Dynamic views don’t support javascript-so reverting back to simple views

Sorry for the temporary loss of GitHub gists...Hopefully dynamic views will support javascript soon!!

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R 2.14.1 is released

December 22, 2011
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Source distributions of the latest maintenance release of R, R 2.14.1, are now available. Binary distributions will begin appearing on local CRAN mirrors in the next few days. This update makes a few small improvements (such as the ability to accurately count the number of available cores for parallel processing on Solaris and Windows, and improved support of grayscale...

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ASU Tuition by Academic Year

December 22, 2011
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ASU Tuition by Academic Year

Description:Arizona State University tuition fees from 1987-2011.Data:https://azregents.asu.edu/ABOR%20Reports/TUITION%20HISTORY.pdfAnalysis:It has been suggested that the 'cost' of tuition has remained the same throughout the years, yet the 'price' of...

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