Monthly Archives: August 2013

Data Scientists and Statisticians: Can’t We All Just Get Along

August 9, 2013
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Data Scientists and Statisticians: Can’t We All Just Get Along

It seems that the title “data science” has taken the world by storm.  It’s a title that conjures up almost mystical abilities of a person garnering information from oceans of data with ease.  It’s where a data scientist can wave his or her hand like a Jedi Knight and simply tell the data what it

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Google Developers R Programming Video Lectures

August 8, 2013
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I got this Google Developers R Programming Video Lectures from Stephen's blog - Getting Genetics Done.Very useful R tutorial for beginner! Short and efficient. Here is what I learned after watching the lectures:4.3 - Add a Warning or Stop the Func...

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R/gridSVG/d3 Line Reverse Data Bind

August 8, 2013
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R/gridSVG/d3 Line Reverse Data Bind

I veer from finance to tech, so let’s use some data from FRED/OECD this time.  I do not think I need to comment much on what has happened to New Car Registrations in Greece. Reverse data binding a line plot from ggplot2 or lattice is slightly more difficult than what we saw in the last post I Want...

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Absolute Deviation Around the Median

August 8, 2013
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Absolute Deviation Around the Median

Median Absolute Deviation (MAD) or Absolute Deviation Around the Median as stated in the title, is a robust measure of central tendency. Robust statistics are statistics with good performance for data drawn from a wide range of non-normally distributed probability distributions. Unlike the standard mean/standard deviation combo, MAD is not sensitive to the presence of outliers. This

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R on Your iPhone (Not the Way You Think)

August 8, 2013
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R on Your iPhone (Not the Way You Think)

If you really love R, you should put it on your iPhone.  Apple gives the measurements for its products here. Let's use a little grid magic with ggplot2 to make a chart for the back of your iphone similar to this. require(grid)require(ggplot2)# thanks for the Apple measurements# https://developer.apple.com/resources/cases/x11( height = as.numeric(convertX(unit(58.55, "mm"), "in")),...

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Bio7 1.7 for Windows Released!

August 8, 2013
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Bio7 1.7 for Windows Released!

07.08.2013 A new Windows version of Bio7 is available. This version comes with a lot of new features and improvements for Java, R and ImageJ. One highlight is that you can now interpret Jython (Python) code with Bio7. In addition a new console implementation is available which offers access to a native shell, different Java

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Summarize content of a vector or data.frame every n entries

August 8, 2013
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Summarize content of a vector or data.frame every n entries

I imagine that the same result can be achieved by a proper use of quantile, but I like to have an easy way to obtain summary statistics every n entries of my dataset be it a vector or data.frame. The function takes three parameters: the R object on which we need to obtain statistics (x),

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Data Science MD July Recap: Python and R Meetup

August 8, 2013
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Data Science MD July Recap: Python and R Meetup

For July’s meetup, Data Science MD was honored to have Jonathan Street of NIH and Brian Godsey of RedOwl Analytics come discuss using Python and R for data analysis. Jonathan started off by describing the growing ecosystem of Python data … Continue reading → The post Data Science MD July Recap: Python and R Meetup appeared first on...

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JSM 2013 – Wednesday

August 8, 2013
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I was able to attend a continuing education short course workshops at the JSM conference that proved to be quite insightful.  The discussion was on data mining and was titled “Applied Data Mining Analysis: A Step-by-Step Introduction Using Real-World Data Sets”.  The presentation was given by Dan Steinberg and the examples that he gave were

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Understanding the *apply() functions and then others in R by asking questions

August 7, 2013
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Understanding the *apply() functions and then others in R by asking questions

The *apply() functions are powerful but designed poorly. The R documents are written poorly. They combined make R very hard to learn. All the time, it seems there are some explanations missing. (Another bad example of documentation is Python docs. I cannot retrieve information from the long long pages with multi-level bullets. Why don’t they

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