Monthly Archives: January 2014

SAS on the road

January 16, 2014
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I like some of the ideas what SAS might need that truck for: The SAS truck travels the country with an IBM S/360, a CRT monitor, and David Hasselhoff, solving crimes. #rstats pic.twitter.com/2DjkAAyalP — Kieran Healy (@kjhealy) January 16, 2014 … Weiterlesen →

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Topological Data Analysis with R

January 16, 2014
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Topological Data Analysis with R

by Joseph Rickert When I was in graduate school in the mid '70s Mathematics departments were still under the spell of abstraction for its own sake. At that time, Algebraic Topology which uses concepts from Abstract Algebra to study topological spaces was a major gateway to the realm of abstraction. On my first visit, it was not at all...

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In data scientist survey, R is the most-used tool (other than databases)

January 15, 2014
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In data scientist survey, R is the most-used tool (other than databases)

O'Reilly has just published the results of the Data Scientist Salary Survey, based on data collected from attendees of the O'Reilly Strata conferences in 2012 and 2013. There were some interesting results from the salary portion of the survey: data scientists at early-stage startups earned a median salary of US$130,000 data scientists at public companies earned a higher median...

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How to see source code of a function/method in R?

January 15, 2014
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If it's an internal function of R (e.g. from base package), just type the function name, like> rowMeansfunction (x, na.rm = FALSE, dims = 1L) {    if (is.data.frame(x))         x <- as.matrix(x)  &nbsp...

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BMHE & BCEA get a shout in published paper

January 15, 2014
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BMHE & BCEA get a shout in published paper

Panagiotis Petrou has posted a link to a recent paper of his, which develops a cost-effectiveness analysis of a drug used as a second-line treatment of renal carcinoma. The analysis is based on a Bayesian Markov model. But (from an incredibly self...

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Quilt plots. Like heat maps, only…heat maps

January 15, 2014
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Quilt plots. Like heat maps, only…heat maps

Stephen tweets: Quilt Plots: A Simple Tool for the #Visualisation of Large Epidemiological Data buff.ly/1doSx4X— Stephen Rudd (@SAGRudd) January 15, 2014 Quilt plots. Sounds interesting. The link points to a short article in PLoS ONE, containing a table and a figure. Here is Figure 1. If you looked at that and thought “Hey, that’s a

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Analyzing the DVI Indicator – Entry Power

January 15, 2014
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Analyzing the DVI Indicator – Entry Power

In a recent post, I did some analysis of the efficiency of the DVI indicator. That was pretty much all I had to say back then, but that quickly changed. While reading Building Reliable Trading Systems, by Keith Fitschen I stumbled upon an alternative way to visualize entry efficiency – the entry power. The chart

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Popularity Contest

January 15, 2014
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Popularity Contest

Although I am sure most of the bloggers that discuss R on R-bloggers are not all that concerned with popularity, I thought it would be interesting to analyze (with R and rCharts, of course) the popularity of these bloggers using Feedly’s API.   After building the chart, I got to thinking about these two...

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R programming tips

January 15, 2014
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R programming tips

After reinventing the wheel a few times, I decided it would be a good idea to keep a list of programming tips or tricks that I find useful, so I started a static page here to keep these tips. It will begin rather haphazardly, but if it grows, I will probably categorize and re-order it. Read the full...

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USDA Textural Soil Classification

January 15, 2014
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USDA Textural Soil Classification

Included in the next version (1.0.3.1) of ggtern, will be a new data set, taken from the USDA Textural Soil Classification which we can use to reproduce the original diagram published by the United Stated Department of Agriculture. Firstly let us load the packages and data: Reconstructing the USDA’s Original Plot Now let us construct… The post USDA...

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