2016-15 Automating R Demonstration Videos

December 7, 2016
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This document describes a proof-of-concept for producing R demonstration videos in a fully-automated manner. The “script” for the video consists of a text file containing code chunks paired with text commentary. The video is produced by running the code while … Continue reading →

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November Package Picks

December 7, 2016
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November Package Picks

by Joseph Rickert November was a prolific month for R developers: 189 new packages landed in CRAN. I have selected more than a quarter of them for this post,...

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Secret Santa Picker 2 using R

December 7, 2016
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Secret Santa Picker 2 using R

Last year I made a blog post about a Secret Santa picker HERE, but to use it required quite a bit of messing around with the code. So this...

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Pipe Dream

December 7, 2016
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Pipe Dream

Plusses and Arrows and Percents, oh my!. - Do...

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Using replyr::let to Parameterize dplyr Expressions

December 6, 2016
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Using replyr::let to Parameterize dplyr Expressions

Imagine that in the course of your analysis, you regularly require summaries of numerical values. For some applications you want the mean of that quantity, plus/minus a standard deviation;...

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Announcing Riyadh R User Group

December 6, 2016
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Announcing Riyadh R User Group

Many data analysts in Riyadh (or as much as I have met) still valiantly use Excel and/or SQL to perform analyses. Some engage in SQL gymnastics for the simple operation...

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the incredible accuracy of Stirling’s approximation

December 6, 2016
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the incredible accuracy of Stirling’s approximation

The last riddle from the Riddler summed up to find the probability of a Binomial B(2N,½) draw ending up at the very middle, N. Which...

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DataChats: An interview with Charlotte Wickham

December 6, 2016
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DataChats: An interview with Charlotte Wickham

Hey R fans! We've just released a new episode of DataCamp's DataChats video series.  In this third episode, we interview Charlotte Wickham. Charlotte is an Assistant Professor in the Department...

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Select and Query Exercise

December 6, 2016
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Select and Query Exercise

In this exercise we cover the basics on selecting and extracting data using queries. We add a few other materials into it. This should prepare you for the next...

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scatterpie for plotting pies on ggplot

December 6, 2016
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scatterpie for plotting pies on ggplot

Plotting pies on ggplot/ggmap is not an easy task, as ggplot2 doesn’t provide native pie geom. The pie we produced in ggplot2 is actually a barplot transform...

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dplyrXdf 0.90 now available

December 6, 2016
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by Hong Ooi, Sr. Data Scientist, Microsoft Version 0.90 of the dplyrXdf package has just been released. dplyrXdf is a package that brings dplyr pipelines and data transformation verbs...

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Why time series forecasts prediction intervals aren’t as good as we’d hope

December 6, 2016
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Why time series forecasts prediction intervals aren’t as good as we’d hope

Five different sources of error When it comes to time series forecasts from a statistical model we have five sources of error: Random individual errors Random estimates of...

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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...

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Reddit Responds to the Election

December 5, 2016
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Reddit Responds to the Election

It’s been about a month since the U.S. presidential election, with Donald Trump’s victory over Hillary Clinton coming as a surprise to most. Reddit user Jason Baumgartner collected and...

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In case you missed it: November 2016 roundup

December 5, 2016
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In case you missed them, here are some articles from November of particular interest to R users. Microsoft R Open 3.3.2, based on R 3.3.2, has been released for...

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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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