Optimization matchup: R’s glpkAPI vs Julia’s JuMP

December 5, 2016
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tl;dr: although I use R every day and love it, doing mathematical programming using Julia is much simpler and more flexible than anything I know that is currently available in R.Recently I have learned that Iain Dunning and Joey Huchette and Miles Lubin have received 2016 INFORMS Computing Society prize for the development of JuMP, a Julia-based domain-specific modeling...

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Interacting With Amazon Athena from R

December 5, 2016
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This is a short post for those looking to test out Amazon Athena with R. Amazon makes Athena available via JDBC, so you can use RJDBC to query data....

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Functions exercises vol. 2

Functions exercises vol. 2

Answers to the exercises are available here. Exercise 1 Create a function...

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Top 5 R Package Maintainers

December 5, 2016
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Top 5 R Package Maintainers

The R Community is powered by open course contributions from a wide variety of individuals. Anyone can create and distribute R packages that benefit the R community and make it...

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EARL Boston Revisited

December 5, 2016
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EARL Boston Revisited

After a successful EARL London in September of this year (see here and here) it was Boston’s turn to shine. This is only the second time this conference has...

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Cross-validation for time series

December 5, 2016
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Cross-validation for time series

I’ve added a couple of new functions to the forecast package for R which implement two types of cross-validation for time series. K-fold cross-validation for autoregression The first is...

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Reading a Table from Yahoo Finance

December 5, 2016
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As you know, the composition of an Index changes over time and this scipt takes the Yahoo Finance page and retrieves all individual stock symbols for you and stores...

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Crime Analysis – Denver-Part 3

December 4, 2016
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Crime Analysis – Denver-Part 3

A look into Denver crime data surrounding marijuana, alcohol, and other drugs using R programming.

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Solar PVC Growth from One Time Investment: A Monte Carlo Analysis Shiny App

December 4, 2016
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Solar PVC Growth from One Time Investment:  A Monte Carlo Analysis Shiny App

Imagine you bought solar PVC arrays today, sold the power generated to your local utility, and used the proceeds to add new solar arrays each year.  What generating capacity...

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Descriptive Analytics-Part 5: Data Visualisation (Continuous variables)

December 4, 2016
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Descriptive Analytics-Part 5: Data Visualisation  (Continuous variables)

Descriptive Analytics is the examination of data or content, usually manually performed, to answer the question “What happened?”. In order to be able to solve this set of exercises...

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How to set up your own R blog with Github pages and Jekyll Bootstrap

December 3, 2016
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How to set up your own R blog with Github pages and Jekyll Bootstrap

This post is in reply to a request: How did I set up this R blog? I have wanted to have my own R blog for a while before I...

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Parametric variable names and dplyr

December 3, 2016
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Parametric variable names and dplyr

When writing reusable code or packages you often do not know the names of the columns or variables you need to work over. This is what I call “parametric...

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Highlighting R code for the web

December 3, 2016
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When blogging about statistics and R, it is very useful to differentiate the body text to R code. I used to manage this issue by highlighting the code and...

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How important is that variable?

December 3, 2016
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When modeling any phenomena by including explanatory variables that highly relates the variable of interest, one question arises: which of the auxiliary variables have a higher influence on the...

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R Course Finder December update!

December 3, 2016
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R Course Finder December update!

A few months ago we launched R course finder, an online directory that helps you to find the right R course quickly. With so many R courses available online,...

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k-fold cross validation with modelr and broom

December 3, 2016
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k-fold cross validation with modelr and broom

@drsimonj here to discuss how to conduct k-fold cross validation, with an emphasis on evaluating models supported by David Robinson’s broom package. Full credit also goes...

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Non-linear dynamics and chaos using R (1)

December 3, 2016
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Non-linear dynamics and chaos using R (1)

I have been teaching the course "Mathematics" for the PhD students at Ca' Foscari University for a few years. In the lectures I cover some "scattered" material that may...

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Be careful evaluating model predictions

December 2, 2016
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Be careful evaluating model predictions

One thing I teach is: when evaluating the performance of regression models you should not use correlation as your score. This is because correlation tells you if a re-scaling...

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Forecast double seasonal time series with multiple linear regression in R

December 2, 2016
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Forecast double seasonal time series with multiple linear regression in R

I will continue in describing forecast methods, which are suitable to seasonal (or multi-seasonal) time series. In the previous post smart meter data of electricity consumption were introduced...

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Stylometry: Identifying authors of texts using R

December 2, 2016
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Stylometry: Identifying authors of texts using R

Few people expect politicians to write every word they utter themselves; reliance on speechwriters and spokepersons is a long-established political practice. Still, it's interesting to know which statements are...

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Understanding SQL and R Training Video

December 2, 2016
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Understanding SQL and R Training Video

Just had a video series released by O'Reilly Media on infiniteskills.com:https://www.infiniteskills.com/training/understanding-sql-and-r.htmlThis course shows you how to combine two of the most popular technologies...

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Writing Good R Code and Writing Well

December 2, 2016
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by Joseph Rickert If you are aspiring to write good R code, you may find it helpful to occasionally spend some time reading about writing: reading about writing R...

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Model Evaluation Exercises 1

December 2, 2016
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Model Evaluation Exercises 1

We are committed to bringing you 100% authentic exercise sets. We even try to include as different datasets as possible to give you an understanding of different problems. No...

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Announcing bookdown: Authoring Books and Technical Documents with R Markdown

December 2, 2016
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Announcing bookdown: Authoring Books and Technical Documents with R Markdown

We have released the R package bookdown (v0.3) to CRAN. It may be old news to some users, but we are happy to make an official announcement today. To install the package...

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D3PartitionR 0.3.0 is available on CRAN

December 2, 2016
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D3PartitionR 0.3.0 is available on CRAN

Yesterday, the new version of D3partitionR was uploaded on CRAN, this version contains some major improvements. 1. General layout: Before this update, the height and width of the widget...

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High Performance CommonMark and Github Markdown Rendering in R

December 2, 2016
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High Performance CommonMark and Github Markdown Rendering in R

This week the folks at Github have open sourced their fork of libcmark (based on the extensive PR by Mathieu Duponchelle), which they use to render markdown...

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Relational operators for intervals with the intrval R package

December 2, 2016
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Relational operators for intervals with the intrval R package

I recently posted a piece about how to write and document special functions in R. I meant that as a prelude for the topic I am writing about in...

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Introduction of the pdfsearch package

December 2, 2016
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I'm happy to introduce an add-on package, pdfsearch, that adds the ability to do keyword searches on pdf files. This add-on package uses the excellent pdftools package from the...

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Extracting Tables from PDFs in R using the Tabulizer Package

December 1, 2016
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Extracting Tables from PDFs in R using the Tabulizer Package

Recently I wanted to extract a table from a pdf file so that I could work with the table in R. Specifically, I wanted to get data on layoffs...

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