Blog Archives

New R plot preferences and improvements for the R editor in Bio7

November 18, 2015
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New R plot preferences and improvements for the R editor in Bio7

18.11.2015 In the current release of Bio7 2.3  two new plot preferences are available to automatically plot data with the size of the visible display (as an image) or with the size of available ImageSizeX and ImageSizeY R workspace variables. The second option is handy if you transfer images from ImageJ to the R workspace

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Competing views on Argentina’s Frontrunner

October 30, 2015
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Competing views on Argentina’s Frontrunner

It might be too early to state anything solid, but the few polls prospecting the runoff election in Argentina seem to be telling two distinct histories. Hugo Haime and IPSOS suggest Daniel Scioli is going up while Elypsis and Polldata say he’s sinking as weeks go by. The last poll published today by Polldata put...

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House Effects in Argentinian polling

October 24, 2015
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House Effects in Argentinian polling

I’ve already posted on “house effects”, the tendency of polling organizations to systematically vary in their results from one another. In this post, I look specifically at these house effects, and show which polling organisations over or under-estimate support for each candidate–compared to the average–in this presidential election in Argentine. The graph above plots the house...

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Argentine’s 2015 Presidential Election Forecasts

October 20, 2015
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Argentine’s 2015 Presidential Election Forecasts

Predictions The model I built to forecast the Argentine’s 2015 presidential election indicates the official candidate have a significant chance of making it right way this Sunday, avoiding a runoff with Mauricio Macri in November. The electoral preference distributions are quite apart from each other, with the distribution of Daniel Scioli about 40% of the positive vote. Preference...</p><p><a href=Read more »

Paranormal Distribution

October 19, 2015
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Paranormal Distribution

In case you want to read an influential paper on this matter, you can find it here. library(ggplot2) library(gridExtra) theme_old <- theme(panel.grid.minor = element_blank(), panel.grid.major = element_blank(), ...

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A Talk About Campaign Finance in Brazil

October 16, 2015
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A Talk About Campaign Finance in Brazil

Last week, I delivered a talk at University of Brasilia about my past research on the topic of campaign finance. I didn’t know in advance about the existence of this seminar. Indeed, it was a big surprise receiving the invitation from Prof. Marcelo Pimentel, who is teaching on Fridays afternoon a class on this topic with more than 50...

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Understanding Margin of Error for Small Populations

October 13, 2015
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Understanding Margin of Error for Small Populations

I got an email today inquiring if the margin of error reported in the newest poll by Datafolha would possibly be misleading. The polling firm often report surveys with regular sizes (1000/2400), so the margin of error calculated is in the range of +/-2% to +/-3%. However, in the latest pool, the pollster sampled 340 congressmen, reporting a...

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Spatstat – An introduction and measurements with Bio7

September 10, 2015
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Spatstat – An introduction and measurements with Bio7

10.09.2015 Here I present a summary of a small spatstat workshop I created. I also explain in several videos how to transfer and convert 2d and 3D ImageJ measurements to a spatial point pattern with Bio7. The example datasets and code samples used here were taken from the spatstat help and from spatstat scripts cited

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Bio7 2.3 Released!

August 28, 2015
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Bio7 2.3 Released!

28.08.2015 As a result of the useR conference 2015 with fantastic workshops and presentations where I also presented my software I released a new version of Bio7 with many improvements and new features inspired by the R conference and important for the next ImageJ conference 2015 where I will give a Bio7 workshop. For this

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ImageJ Selections to Georeferenced Spatial Objects

August 5, 2015
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ImageJ Selections to Georeferenced Spatial Objects

05.08.2015 As a result of the last UseR conference and some great spatial workshops and talks where I participated I decided to rework the selection dialog for the upcoming Bio7 2.3 to transfer ImageJ selection data as ‘Spatial Objects’ with the help of the package ‘sp‘ and the Java GDAL binding (version 1.7.1). Video: One

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