# Blog Archives

## The butterfly curve

October 7, 2015
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I came across the butterfly curve, which was discovered by Temple Fay. The butterfly curve is produced by a parametric equation where: x = sin(t) * (e^cos(t)-2cos(λt)-sin(t/12)^5) and y = cos(t) * (e^cos(t)-2cos(λt)-sin(t/12)^5). Where t stands for time and λ for a user input variable. I used ggplot to create a plot of the butterfly … Read More...

## Isn’t sad that all that matters in an election is the candidate’s height?

September 15, 2015
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I came across the claim in the US press suggesting that the taller the candidate, the better his/her chances for success in presidential elections. After a little search, I found this Wikipedia entry, and even some academic research on the issue, mainly relating this phenomenon to some sort of evolutionary instinctual preference. At least in

## Argentine general election, 2015

August 7, 2015
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The 2015 Argentine's presidential election to be held next October 25th is approaching and the dispute begun to appear more clearly since the major parties announced their potential candidates last June. This Sunday, the political parties are holding their primaries for the upcoming presidential election. As in US, in Argentine the primaries are important for

## Ternary plots in politics

August 4, 2015
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This week, I read a post by Nicholas Hamilton about ternary plots that made me think, how this geometric diagram has many different application in science fields. Couple weeks ago, I was reading a book by Donald Saari, who uses ternary charts massively to project election outcomes in different electoral settings. Perhaps, most common, ternary

## I loved this %>% crosstable

July 28, 2015
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This is a public tank you for @heatherturner's contribution. Now the SciencesPo's crosstable can work in a chain (%>%) fashion; useful for using along with other packages that have integrated the magrittr operator. > candidatos %>% + filter(desc_cargo == 'DEPUTADO ESTADUAL'| desc_cargo =='DEPUTADO DISTRITAL' | desc_cargo =='DEPUTADO FEDERAL' | desc_cargo =='VEREADOR' | desc_cargo =='SENADOR') %>%

## The Greek thing II

July 4, 2015
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Just few hours before Greeks head to the polls to decide on the bailout agreement, and ultimately, whether the country will stay in the euro, there is no overwhelming advantage of either side. Actually, the margin became blurred over the last three days, with the "Yes" position rehearsing a last-minute recovery. Despite this last-minute trend, … Read More...

## The Greek thing

July 4, 2015
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Greeks have been quite volatile on their opinion whether they should accept or not a proposal by the country's creditors for more austerity to keep aid flowing. The polls conducted over this week look like crazy, though that "belly" was likely provoked by the anxiety on what comes next after Greece not paying IMF back. … Read More...

## Network analysis with igraph

June 23, 2015
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Suddenly, I had to learn network analysis. Two weeks ago I started with a book by Christakis and Fowler, then a book by Kolaczyk and Csárdi, now here I am in a “how to” analyse network data using R moment. This is much like learning-by-doing knowledge, so may be useful for newcomers, although at this … Read More...

## LDA on Ferguson Grand Jury I

December 9, 2014
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Tweet The case of Michael Brown, an unarmed black teenager, who was shot and killed on August 9th, by Darren Wilson, a white police officer, in Ferguson has driven public opinion around the globe to the suburb of St. Louis. After few weeks, on Nov. 24, the St. Louis County prosecutor announced that a grand … Read More...

## Study of a plot

December 3, 2014
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I began to think on a nice way of plotting campaign expenditures in a paper I'm working on. I thought this would be something like the following--simple but meaningful even when there are outliers in both tails. Though I like the seniors Tukey's boxplot and scatter plots, I had already used them the last time … Read More...