3908 search results for "gis"

Fun with the Raspberry Pi

January 21, 2014
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Fun with the Raspberry Pi

Since Christmas I have been playing around with a Raspberry Pi. It is certainly not the fastest computer, but what a great little toy! Here are a few experiences and online resources that I found helpful. SetupInitially I connected the Raspberry Pi via HDMI to a TV; together with keyboard, mouse and an old USB Wifi adapter....

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Use standard deviation (not mad about MAD)

January 19, 2014
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Use standard deviation (not mad about MAD)

Nassim Nicholas Taleb recently wrote an article advocating the abandonment of the use of standard deviation and advocating the use of mean absolute deviation. Mean absolute deviation is indeed an interesting and useful measure- but there is a reason that standard deviation is important even if you do not like it: it prefers models that Related posts:

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Evolution hospital beds, resources and consumption

January 19, 2014
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Evolution hospital beds, resources and consumption

For this analysis publicly available data from the OECD is used. The time series run from 1975 to 2013 (where available). Let’s focus on Belgium, Germany, France, The Netherlands, United Kingdom, United States, Norway and Switzerland and have a look at their number of hospital beds per 1000 population. The blue line is a trend The post

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Retail Relative Strength

January 16, 2014
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Retail Relative Strength

So back before Thanksgiving I did a post Something to Think About Before Black Friday | rChart + dygraphs.  Well since then I have noticed that Retail relative strength has deteriorated considerably.  I thought it would be a good time to use ...

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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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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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Computing and visualizing LDA in R

January 15, 2014
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Computing and visualizing LDA in R

As I have described before, Linear Discriminant Analysis (LDA) can be seen from two different angles. The first classify a given sample of predictors to the class with highest posterior probability . It minimizes the total probability of misclassification. To compute it uses Bayes’ rule and assume that follows a Gaussian distribution with class-specific mean

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How many more R-bloggers posts can I expect?

January 14, 2014
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How many more R-bloggers posts can I expect?

I noticed that the monthly number of posts on R-bloggers stopped increasing over the last year. Indeed, the last couple of months saw a decline in posts compared to the previous year. Thus, has most been said and written about R already? Who knows? Wel...

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New d3.js visualization: Interpreting Cohen’s d effect size

January 13, 2014
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New d3.js visualization: Interpreting Cohen’s d effect size

I have created a new visualization in D3. The purpose is to aid in the interpretation of Cohen’s d. The visualization presents Cohen’s d in the following ways: Visually, Cohen’s U3, Probability of superiority, Percentage of overlap and Number needed to treat. The visualization should work on mobile phones and tablets, but it...

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Hungarian RUG: lighting talks

January 13, 2014
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Hungarian RUG: lighting talks

The only Hungarian R User Group so far, the Budapest Users of R Network (BURN), with already more than 120 members, is hosting several lighting talks on the 15th of January (Wednesday): Bence Arató (BI Consulting): Who uses R? László Bodó: C++ calls in R Csaba Burger (Burg Analytics): Financial decisions with lme4  Gergely Daróczi (rapporter.net): A Pandoc writer in R Imre Kocsis (

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