Monthly Archives: October 2012

Have I chosen the right power company?

October 3, 2012
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Have I chosen the right power company?

Do you always wonder if I have chosen the right power company and have not been over charged? Your questions may be answered here (if you reside in Wellington, New Zealand). Power costs per day and per month_Oct_2012 shows which company … Continue reading →

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A post about greater blogs

October 3, 2012
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I'm very glad if you use or at least read sometimes my blog. However, I'd like to give you a list of wonderful blogs which are useful if you are interested in applied mathematics and programming for simulation.My favorite one is written by Arthur Charp...

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Perculiar behaviour of the sum function

October 3, 2012
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The sum function in R is a special one in contrast to other summary statistics functions such as mean and median. The first distinguish is that it is a Primitive function where the others are not (Although you can call mean using .Internal). This ...

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Transforming a color scale

October 3, 2012
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Transforming a color scale

In developing plots, I often use color (or “colour” in ggplot2 parlance) to reflect values of a third, non-X/Y, variable. Depending on the distribution of this Z variable, however, the effective color range can be narrow, making it difficul...

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A Quick Note On Large 2D Data

October 3, 2012
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A Quick Note On Large 2D Data

Two months ago I was told one of my old blog posts was borrowed to this post: Finding patterns in big data with SAS/GRAPH. I wrote my blog post four years ago just for fun. The over-plotting issue is pretty boring to me now, but what caught my attentio...

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Oracle R Enterprise Tutorial Series on Oracle Learning Library

October 2, 2012
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Oracle Server Technologies Curriculum has just released the Oracle R Enterprise Tutorial Series, which is publicly available on Oracle Learning Library (OLL). This 8 part interactive lecture series with review sessions covers Oracle R Enterprise ...

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Emerging as Low Vol

October 2, 2012
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Emerging as Low Vol

Extending the series begun with When Russell 2000 is Low Vol, I thought I should take a look at Emerging Market stocks during periods of low relative volatility to the S&P 500.  So you can replicate even without access to expensive data, let

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Clegg vs Pleb: An XKCD-esque chart

October 2, 2012
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Clegg vs Pleb: An XKCD-esque chart

I saw an interesting “challenge” on StackOverflow last night to create an XKCD style chart in R. A couple of hours later & going in a very similar direction to a couple of the answers on SO, I got to something that looked pretty good, using the sin and cos curves for simple and reproducible … Continue reading...

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Loading Packages and Functions Automatically in R

October 2, 2012
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Loading Packages and Functions Automatically in R

For a long time, I was wondering how to get R to automatically load packages I use every time I open the program. For example, for a variety of reasons, I use the ‘Cairo’ package to save all my figures as … Continue reading →

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R 2.15.2 scheduled for October 26

October 2, 2012
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The next minor update to R — version 2.15.2 "Trick or Treat" — will be released on October 26, R-core member Peter Dalgaard announced today. You can find the planned updates in the current NEWS file (scroll down to the section 'CHANGES IN R VERSION 2.15.1 patched'; the changes at the top of the file are planned for the...

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