R

Blogs on the R software.

Introducing: The Open Science Committee at our department

July 28, 2015
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Large-scale replication projects of the last years (e.g., ManyLabs I, II, and III, Reproducibility Project: Psychology) showed that the “replication crisis” in psychology is more than just hot air: According to recent estimates, ~60% of cur...

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') %>% […]

Pluto: To Catch an Icy King

July 28, 2015
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Sly as a fox, it is. Mysterious and diminutive, it has eluded us for decades. Despite what we've learned about Pluto, constant debate continues to rage over its classification. From the moment it was discovered, astronomers have bickered over this icy ...

Goals for the New R Consortium

July 28, 2015
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by Bob Muenchen The recently-created R Consortium consists of companies that are deeply involved in R such as RStudio, Microsoft/Revolution Analytics, Tibco, and others. The Consortium’s goals include advancing R’s worldwide promotion and support, encouraging user adoption, and improving documentation … Continue reading →

Notes from the 3rd R in Insurance Conference

July 28, 2015
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Photo: Arthur CharpentierThe R in Insurance conference in Amsterdam was a sold out success! Congratulations to the organising committee at the University of Amsterdam, and many thanks to our sponsors:Milliman, RStudio, CYBAEA, Deloitte, a.s.r., Triple ...

Egyptian fractions [Le Monde puzzle #922]

July 27, 2015
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For its summer edition, Le Monde mathematical puzzle switched to a lighter version with immediate solution. This #922 considers Egyptian fractions which only have distinct denominators (meaning the numerator is always 1) and can be summed. This means 3/4 is represented as ½+¼. Each denominator only appears once. As I discovered when looking on line, […]

Predicting Titanic deaths on Kaggle II: gbm

July 26, 2015
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Following my previous post I have decided to try and use a different method: generalized boosted regression models (gbm). I have read the background in Elements of Statistical Learning and arthur charpentier's nice post on it. This data ...

Why I use Panel/Multilevel Methods

July 24, 2015
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$Why I use Panel/Multilevel Methods$

I don’t understand why any researcher would choose not to use panel/multilevel methods on panel/hierarchical data. Let’s take the following linear regression as an example: , where is a random effect for the i-th group. A pooled OLS regression model for the above is unbiased and consistent. However, it will be inefficient, unless for all […]

Call for participation: AusDM 2015, Sydney, 8-9 August

July 23, 2015
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************************************************************* The 13th Australasian Data Mining Conference (AusDM 2015) Sydney, Australia, 8–9 August 2015 URL: http://ausdm15.ausdm.org/ ************************************************************* The Australasian Data Mining Conference is devoted to the art and science of intelligent data mining: the meaningful analysis of (usually large) data … Continue reading →

Le Monde puzzle [#920]

July 22, 2015
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A puzzling Le Monde mathematical puzzle (or blame the heat wave): A pocket calculator with ten keys (0,1,…,9) starts with a random digit n between 0 and 9. A number on the screen can then be modified into another number by two rules: 1. pressing k changes the k-th digit v whenever it exists into […]